United Nations Interim Forces in Lebanon (UNIFIL) military police cars drive past a concrete separation barrier between the southern Lebanese village of Kfar Kila and Israel on the border between the two countries on December 4, 2018. - Israel's army said on December 4 it had detected Hezbollah "attack tunnels" infiltrating its territory from Lebanon and had launched an operation called "Northern Shield" to destroy them, a move likely to raise tensions with the Iran-backed group. (Photo by Ali DIA / AFP)

A United Nations Interim Forces in Lebanon (UNIFIL) armoured personnel carrier drives past a concrete border wall between the southern Lebanese village of Kfar Kila and Israel on December 4, 2018. - Israel's army said on December 4 it had detected Hezbollah "attack tunnels" infiltrating its territory from Lebanon and had launched an operation called "Northern Shield" to destroy them, a move likely to raise tensions with the Iran-backed group. (Photo by Ali DIA / AFP)

A Lebanese army vehicle followed by United Nations Interim Forces in Lebanon (UNIFIL) military police cars drive past a concrete separation barrier between the southern Lebanese village of Kfar Kila and Israel on the border between the two countries on December 4, 2018. - Israel's army said on December 4 it had detected Hezbollah "attack tunnels" infiltrating its territory from Lebanon and had launched an operation called "Northern Shield" to destroy them, a move likely to raise tensions with the Iran-backed group. (Photo by Ali DIA / AFP)

United Nations Interim Forces in Lebanon (UNIFIL) vehicles and armoured personnel carriers (APC) are seen on a road near the border between the southern Lebanese village of Kfar Kila and Israel on December 4, 2018, with a poster depicting Lebanese parliament speaker Nabih Berri (L), Syrian President Bashar al-Assad (C), and Hezbollah leader Hasan Nasrallah (R) seen in the corner. - Israel's army said on December 4 it had detected Hezbollah "attack tunnels" infiltrating its territory from Lebanon and had launched an operation called "Northern Shield" to destroy them, a move likely to raise tensions with the Iran-backed group. (Photo by Ali DIA / AFP)

United Nations Interim Forces in Lebanon (UNIFIL) vehicles and armoured personnel carriers (APC) are seen on a road near the border between the southern Lebanese village of Kfar Kila and Israel on December 4, 2018, with a poster depicting Lebanese parliament speaker Nabih Berri (L), Syrian President Bashar al-Assad (2nd-L) seen in the corner. - Israel's army said on December 4 it had detected Hezbollah "attack tunnels" infiltrating its territory from Lebanon and had launched an operation called "Northern Shield" to destroy them, a move likely to raise tensions with the Iran-backed group. (Photo by Ali DIA / AFP)

United Nations Interim Forces in Lebanon (UNIFIL) vehicles are seen driving on a road near the border between the southern Lebanese village of Kfar Kila and Israel on December 4, 2018. - Israel's army said on December 4 it had detected Hezbollah "attack tunnels" infiltrating its territory from Lebanon and had launched an operation called "Northern Shield" to destroy them, a move likely to raise tensions with the Iran-backed group. (Photo by Ali DIA / AFP)

Israeli soldiers speak with a United Nations Interim Force in Lebanon (UNIFIL) liason officer as they stand along the border with Lebanon near the town of Metula on December 4, 2018. - Israel's army said on December 4 it had detected Hezbollah "attack tunnels" infiltrating its territory from Lebanon and had launched an operation called "Northern Shield" to destroy them, a move likely to raise tensions with the Iran-backed group. (Photo by JALAA MAREY / AFP)

Israeli soldiers speak with a United Nations Interim Force in Lebanon (UNIFIL) liason officer as they stand along the border with Lebanon near the town of Metula on December 4, 2018. - Israel's army said on December 4 it had detected Hezbollah "attack tunnels" infiltrating its territory from Lebanon and had launched an operation called "Northern Shield" to destroy them, a move likely to raise tensions with the Iran-backed group. (Photo by JALAA MAREY / AFP)

United Nations Interim Force in Lebanon (UNIFIL) soldiers patrol along the border wall with Israel near the southern Lebanese village of Kfar Kila on December 4, 2018. - Mail from : zayyatmahmoud@hotmail.com to : Photo.MENA@afp.com, mailbox.NICPHO@afp.com Subject : mahmoud zayyat 02 (Photo by Mahmoud ZAYYAT / AFP)

United Nations Interim Force in Lebanon (UNIFIL) soldiers patrol along the border wall with Israel near the southern Lebanese village of Kfar Kila on December 4, 2018. - Mail from : zayyatmahmoud@hotmail.com to : Photo.MENA@afp.com, mailbox.NICPHO@afp.com Subject : mahmoud zayyat 02 (Photo by Mahmoud ZAYYAT / AFP)

United Nations Interim Force in Lebanon (UNIFIL) soldiers patrol along the border wall with Israel near the southern Lebanese village of Kfar Kila on December 4, 2018. - Mail from : zayyatmahmoud@hotmail.com to : Photo.MENA@afp.com, mailbox.NICPHO@afp.com Subject : mahmoud zayyat 02 (Photo by Mahmoud ZAYYAT / AFP)

United Nations Interim Force in Lebanon (UNIFIL) soldiers patrol along the border wall with Israel near the southern Lebanese village of Kfar Kila on December 4, 2018. - Mail from : zayyatmahmoud@hotmail.com to : Photo.MENA@afp.com, mailbox.NICPHO@afp.com Subject : mahmoud zayyat 02 (Photo by Mahmoud ZAYYAT / AFP)