A fishing boat sank in the East China Sea Sunday, with two sailors rescued and the other five still missing as of 3:30 p.m. Monday, local police said Monday.

The boat with seven people on board sank off the coast of east China's Zhejiang Province for no apparent reason at around 10 p.m. Sunday, said Zhang Zhenyuan, a Zhoushan frontier police officer.

Two sailors were rescued by nearby fishing boats. Rescuers were still searching for the other five, Zhang said.

Police are investigating the cause of the accident.