An Air China flight to Beijing made an unscheduled landing in the central Chinese city of Zhengzhou on Sunday after a passenger threatened a flight attendant with a fountain pen, the country's civil aviation authority said.
In a brief statement on its website, the Civil Aviation Administration of China said an unidentified passenger on Air China Flight 1350 attempted to use the pen to restrain the flight attendant "under duress".
Passengers and crew remained unharmed, the statement said, without providing further details.
The flight took off from Changsha, the capital of the southern province of Hunan, at 8:40 am and was expected to arrive at Beijing International Airport at approximately 11:00 am, according to local media reports and detection sites flights.
But he made an unscheduled landing at Zhengzhou Xinzheng International Airport in central Henan province at 9:58 am, according to a previous post on Air China's official microblog.
Air China said in the post that the plane made an unscheduled stop due to "public safety reasons", and that police and civil aviation authorities were handling the situation.