CHONGQING, Feb. 25 -- An Air China flight was forced to make an emergency landing in southwest China's Chongqing Municipality Wednesday due to a bomb scare.

Flight CA1336 left Nanning City in south China's Guangxi Zhuang Autonomous Region for Beijing at 12:24 p.m. It was forced to land in Chongqing airport at 1:59 p.m., after a passenger claimed that an explosive device was onboard, said sources with the Chongqing branch of Air China.

Witnesses said emergency services were at the airport.

As of 5 p.m., three passengers were taken away by police for questioning. The remaining passengers continued the journey on to Beijing after a security check.

The investigation continues.