A security official stands guard outside the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Security officials stand guard outside the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Security officials walk outside the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Security officials stand guard outside the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

A security official stands guard near the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

A police officer cordons off the area close to the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Resident gather at an area near to the location where police have locked down close to the mosques where a shooting incident took place in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

A police officer directs residents after an area close to mosques where a shooting incident took place was cordoned off in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Police officers stand guard in front of the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Police officers stand guard in front of the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Police officers guard the area close to the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Police officers guard the area close to the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 40 dead on March 15, with one gunman - identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Police officers are seen at the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Police officers are seen at the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

A forensic official works at the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

A police officer secures the area in front of the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

The New Zealand national flag is flown at half-mast on a Parliament building in Wellington on March 15, 2019, after a shooting incident in Christchurch. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Marty MELVILLE / AFP)

The New Zealand national flag is flown at half-mast on a Parliament building in Wellington on March 15, 2019, after a shooting incident in Christchurch. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Marty MELVILLE / AFP)

The New Zealand national flag is flown at half-mast on a Parliament building in Wellington on March 15, 2019, after a shooting incident in Christchurch. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Marty MELVILLE / AFP)

The New Zealand national flag is flown at half-mast on a Parliament building in Wellington on March 15, 2019, after a shooting incident in Christchurch. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Marty MELVILLE / AFP)

Flowers and candles are placed on the front steps of the Wellington Masjid mosque in Kilbirnie in Wellington on March 15, 2019, after a shooting incident at two mosques in Christchurch. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Marty MELVILLE / AFP)

Flowers are placed on the front steps of the Wellington Masjid mosque in Kilbirnie in Wellington on March 15, 2019, after a shooting incident at two mosques in Christchurch. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Marty MELVILLE / AFP)

Flowers are tied to the fence on the front of the Wellington Masjid mosque in Kilbirnie in Wellington on March 15, 2019, after a shooting incident at two mosques in Christchurch. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Marty MELVILLE / AFP)

Flowers are placed on the front steps of the Wellington Masjid mosque in Kilbirnie in Wellington on March 15, 2019, after a shooting incident at two mosques in Christchurch. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Marty MELVILLE / AFP)

Police pay a visit to reassure the staff of the Wellington Masjid mosque in Kilbirnie in Wellington on March 15, 2019, after a shooting incident at two mosques in Christchurch. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Marty MELVILLE / AFP)

Members of the Muslim community wait outside a hospital after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

A Muslim family waits outside a hospital after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

A Muslim family waits outside a hospital after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Police cordon off the area in front of the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Police cordon off the area in front of the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

Police officers secure the area in front of the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)

A police officer secures the area in front of the Masjid al Noor mosque after a shooting incident in Christchurch on March 15, 2019. - Attacks on two Christchurch mosques left at least 49 dead on March 15, with one gunman -- identified as an Australian extremist -- apparently livestreaming the assault that triggered the lockdown of the New Zealand city. (Photo by Tessa BURROWS / AFP)