A passenger plane of China Eastern Airlines stops at berth at Beijing Daxing International Airport in Beijing, capital of China, May 13, 2019. (Photo: Xinhua)

A China Eastern plane made an emergency landing on Wednesday morning in Nanjing, East China's Jiangsu province, after a portable charger caught fire and triggered its smoke detectors.

According to Nanjing Lukou International Airport, the MU2809 flight from Nanjing to Xiamen took off at 7:06 am and had to return to the airport due.

The plane landed at the airport at 8:24 am.

The airport's security department checked the portable charger that caused the accident and confirmed that it met security demands.

The charger had a capacity of 40.7Wh, while China allows passengers to take chargers with a capacity of less than 100Wh on board, the airport said.

Police are still investigating the accident.