(Reuters) Hong Kong police fired volleys of tear gas to break up anti-government protests in a gritty industrial suburb on Saturday after activists threw petrol bombs and bricks as China freed a British consulate worker whose detention had fueled tensions. Four MTR subway stations were closed around Kwun Tong a densely populated area of the Chinese-ruled city on the east of the Kowloon peninsula but thousands packed the streets anyway most carrying umbrellas against the sun. Police used tear gas after some protesters threw Molotov cocktails and bricks and others tore up smart" lamp posts equipped with surveillance cameras. Others had set up roadblocks with bamboo scaffolding. RELATED COVERAGE Hong Kong police use tear gas to try to disperse protests British government welcomes Chinas release of Hong Kong consulate employee It was the first use of tear gas in 10 days after a series of mostly peaceful demonstrations in the former British colony. There were no immediate reports of injuries. Give me democracy or give me death" was spray-painted on a wall an illustration how the demands of the protesters have expanded beyond the withdrawal of a bill that would have allowed extraditions to China.