Police in China have named two suspects linked to a "major incident" in Beijing, after a deadly car crash in Tiananmen Square, state media report.
The vehicle crashed into a crowd and burst into flames, killing five people.
"A major incident has taken place on Monday," the police notice said, without specifying what. It named two residents from Xinjiang's Pishan and Shanshan counties as suspects.
The notice, unconfirmed images of which have been widely circulated on Chinese social media, also asked hotels to look out for "suspicious guests" and vehicles.
Zhao Fuzhou, a security official at Beijing's Xinjiang Dasha hotel, said that police had circulated a notice to hotels searching for information about two suspects with Uighur names, AP news agency reported.
Xinjiang is home to the minority Muslim Uighur group, some of whom complain of cultural and religious repression under Beijing's rule. There have been sporadic outbreaks of violence in Xinjiang, including in both Pishan and Shanshan counties. China says it grants the Uighurs wide-ranging freedoms.
In June, riots in Xingjian's Turpan prefecture, which is in Shanshan county, killed 27 people. State media said police opened fire after a mob armed with knives attacked police stations and a local government building.
In April another incident in the city of Kashgar left 21 people dead. The government said the violence was linked to terrorist activity, but local people told the BBC it involved a local family who had a longstanding dispute with officials over religious freedom.
One unconfirmed report said that the authorities suspected that Monday's incident was a suicide attack. Reuters news agency reported that an unnamed source with ties to the leadership had said that the crash looked "like a premeditated suicide attack".
BBC News - Tiananmen crash: China police 'seek Xinjiang suspects'