Eleven people have died and five remain missing after a fishing boat sank off the coast of the northeastern Chinese seaport of Dalian, maritime authorities said Thursday.

Following the latest rescue efforts, the number of people reported dead in the accident rose from nine to 11. Their identities have already been confirmed but have not been released by the authorities.

The boat with 17 people on board sank in the wee hours of Wednesday amid strong waves during an attempt to hook the boat to a larger vessel.

The bodies of nine of the fishermen were recovered Wednesday afternoon, while the other two were found Thursday.

The only survivor rescued from the boat is listed is good condition at a hospital in Liaoning province, where Dalian is located.

Authorities said the rescue operation involving a helicopter, seven maritime patrol vessels and 120 other boats was still ongoing.