HONG KONG, (DNA) — China rotated troops in its People’s Liberation Army (PLA) garrison in Hong Kong on Thursday (Aug 29), days before protesters planned to hold a march calling for full democracy for the Chinese-ruled city after three months of sometimes violent demonstrations.

Chinese state media described the troop movement in the early hours as routine and Asian and Western diplomats watching PLA movements in the former British colony had been expecting it.

But, even if routine, the timing is likely to hit nerves in the “special administrative region” of Hong Kong, which returned to China in 1997.

China’s military will make even greater contributions to maintaining Hong Kong’s prosperity and stability.

The military had completed a routine troop rotation of air, land and maritime forces, the news agency said. Xinhua and the People’s Daily released pictures and footage of armoured personnel carriers moving in convoy in Hong Kong before dawn, their lights flashing.

Observers estimate the Hong Kong garrison numbers between 8,000 and 10,000 troops split between bases in southern China and a network of former British army barracks in Hong Kong.

Trucks full of white-gloved PLA soldiers rolled into Hong Kong within hours of the 1997 handover, raising questions about their role. They stage frequent drills but have seldom since been seen outside their bases.

on Thursday saw significantly more activity in and around the PLA’s Shek Kong military base in the rural New Territories than has been apparent in recent months.

China has denounced the protests and accused the United States and Britain of interfering in its affairs in Hong Kong. It has sent clear warnings that forceful intervention is possible.

Hundreds of People’s Armed Police this month conducted exercises at a sports stadium in Shenzhen that borders Hong Kong a day after the US State Department said it was “deeply concerned” about their movements.