Urumqi (China), July 17 (Xinhua) All 433 mosques that were closed after last week's widespread riots here in northwest China opened for the Friday prayers, officials said.

At least 192 people were killed in the riots July 5 in this Chinese provincial capital of Xinjiang.

The mosques were closed at the request of imams due to security reasons, an official in charge of the religious affairs said.

Local residents said the police have tightened security around the mosques, as large numbers of people waited outside the shrines for their Friday prayers.

'More security staff were sent here. Members of the congregation must open their bags for security checks before entering the mosque,' the official said.

After the prayers, people also came out in large numbers to buy their essential commodities in the market.