A US official said Washington was monitoring a 'congregation' of Chinese forces
The official also said there could be a build-up of military troops or armed police
The White House has said that it is monitoring a sudden 'congregation' of Chinese forces at the border of Hong Kong, according to reports, amid fears that Beijing could step up their control over the city's unrest which has escalated to unprecedented level.
A White House official, who wished to remain anonymous, told journalists that there could be a build-up of military troops or armed police at the border between mainland China and Hong Kong without giving further details, reported Bloomberg.
Hong Kong has been rocked by protests over the past two months against a proposed bill that would allow people to be extradited from the city to stand trial in Communist Party-controlled courts in mainland China.
Hong Kong and the mainland Chinese city of Shenzhen shares a 37-kilometre (22-mile) border.
Around 230,000 people travel between the two cities a day through Luohu, a major land checkpoint linking Shenzhen to Hong Kong, according to official statistics.