HANGZHOU, June 6 -- A Chinese navy airplane crashed late Thursday night during a training mission in east China's Zhejiang Province, said navy sources on Friday.

The plane, part of the Donghai Fleet of the Chinese navy, crashed at 10:37 p.m. Thursday in a mountainous region of Yiwu in Zhejiang when conducting a tactical training mission, the sources said.

The accident did not cause collateral damage, they confirmed.

The navy is trying hard to search for and rescue the crew, the sources said, but they did not reveal how many people were on board.