In this image made from video, armed police vehicles are parked outside Shenzhen Bay Stadium in Shenzhen, near Hong Kong, Friday, Aug. 16, 2019. Satellite photos show what appear to be armored personnel carriers and other vehicles belonging to the China's paramilitary People's Armed Police parked in a sports complex in the city of Shenzhen, in what some have interpreted as a threat from Beijing to use increased force against pro-democracy protesters across the border in Hong Kong.(AP Photo/Dake Kang)

In this image made from video, armed police vehicles are parked outside Shenzhen Bay Stadium in Shenzhen, near Hong Kong, Friday, Aug. 16, 2019. Satellite photos show what appear to be armored personnel carriers and other vehicles belonging to the China's paramilitary People's Armed Police parked in a sports complex in the city of Shenzhen, in what some have interpreted as a threat from Beijing to use increased force against pro-democracy protesters across the border in Hong Kong.(AP Photo/Dake Kang)

Armored vehicles and troop trucks are parked in a lot by Shenzhen Bay Stadium in Shenzhen, China Friday, Aug. 16, 2019. Armored vehicles belonging to China's paramilitary People's Armed Police were parked in the sports complex across the border in Hong Kong, in what some have interpreted as a threat against pro-democracy protesters. (AP Photo/Dake Kang)

Armored vehicles and troop trucks are parked in a lot by Shenzhen Bay Stadium in Shenzhen, China Friday, Aug. 16, 2019. Armored vehicles belonging to China's paramilitary People's Armed Police were parked in the sports complex across the border in Hong Kong, in what some have interpreted as a threat against pro-democracy protesters. (AP Photo/Dake Kang)

Armored vehicles and troop trucks are parked in a lot by Shenzhen Bay Stadium in Shenzhen, China Friday, Aug. 16, 2019. Armored vehicles belonging to China's paramilitary People's Armed Police were parked in the sports complex across the border in Hong Kong, in what some have interpreted as a threat against pro-democracy protesters. (AP Photo/Dake Kang)

Armored vehicles and troop trucks are parked in a lot by Shenzhen Bay Stadium in Shenzhen, China Friday, Aug. 16, 2019. Armored vehicles belonging to China's paramilitary People's Armed Police were parked in the sports complex across the border in Hong Kong, in what some have interpreted as a threat against pro-democracy protesters. (AP Photo/Dake Kang)

Armored vehicles and troop trucks are parked in a lot by Shenzhen Bay Stadium in Shenzhen, China Friday, Aug. 16, 2019. Armored vehicles belonging to China's paramilitary People's Armed Police were parked in the sports complex across the border in Hong Kong, in what some have interpreted as a threat against pro-democracy protesters. (AP Photo/Dake Kang)

Armored vehicles and troop trucks are parked in a lot by Shenzhen Bay Stadium in Shenzhen, China Friday, Aug. 16, 2019. Armored vehicles belonging to China's paramilitary People's Armed Police were parked in the sports complex across the border in Hong Kong, in what some have interpreted as a threat against pro-democracy protesters. (AP Photo/Dake Kang)

Armored vehicles and troop trucks are parked in a lot by Shenzhen Bay Stadium in Shenzhen, China Friday, Aug. 16, 2019. Armored vehicles belonging to China's paramilitary People's Armed Police were parked in the sports complex across the border in Hong Kong, in what some have interpreted as a threat against pro-democracy protesters. (AP Photo/Dake Kang)

Armored vehicles and troop trucks are parked in a lot by Shenzhen Bay Stadium in Shenzhen, China Friday, Aug. 16, 2019. Armored vehicles belonging to China's paramilitary People's Armed Police were parked in the sports complex across the border in Hong Kong, in what some have interpreted as a threat against pro-democracy protesters. (AP Photo/Dake Kang), APTOPIX