The UK and US governments have issued a warning about possible threats against Westerners in the Chinese capital Beijing on or around Christmas Day.
British and US officials say they have received information of possible threats in Sanlitun, which is a busy bar and shopping district.
They did not provide any further details.
Beijing police say they have issued a yellow alert to ensure security over the Christmas period.
A yellow alert is the second lowest level in China's four-level security alert system.
The alert means there will be increased security checks in shopping areas, and rubbish bins in public areas will be checked every 30 minutes, state news agency Xinhua reports.
There was an increased police presence in Sanlitun on Thursday, with armed police deployed outside shopping malls.
The Sanlitun area, in Beijing's Chaoyang district, contains many bars and restaurants popular with foreigners.