BEIJING — Nine assailants were shot and killed Saturday night after they tried to storm a police station in the restive western province of Xinjiang, the state-run Xinhua news agency and Radio Free Asia said. Two police officers also died in the attack.

Details of the assault were sparse, but the news agency said the attackers in Selibuya had been armed with knives and axes. Calls to the authorities in Kashgar, about 100 miles from the police station, and in the nearby town of Bachu were not answered.

The violence occurred more than two weeks after the Chinese authorities arrested five people from Xinjiang Province in connection with an attack last month on Beijing’s Tiananmen Square that left five dead. The Chinese government has suggested that those suspects are Uighur separatists.

Xinhua did not identify the assailants on Saturday as Uighurs, an ethnic minority concentrated in Xinjiang. Twenty-one people died in clashes between Uighurs and the police in the same area earlier this year.