An emergency evacuation slide opened on a China Southern Airlines aircraft when it was ready for takeoff at Chongqing Jiangbei International Airport on Friday afternoon, said a source familiar with the matter.

The incident occurred on an Airbus A321-200 aircraft, Registration B-6343 performing China Southern flight CZ3456 bound for Shenzhen from Chongqing. Before the flight taking off at 4:51 p.m., a passenger opened the emergency exit door near the lavatory accidently after he came back from lavatory, according to a Weibo post. No injuries were reported.