BEIJING - Two new patrol vessels have been in service for China's marine surveillance, according to the State Oceanic Administration (SOA).

The vessels, Haijian 137 and Haijian 110, are both in 3,000-tonne class, said the statements from the administration.

Haijian 137 joined the Donghai fleet under the China Marine Surveillance (CMS), a maritime law enforcement agency under the SOA, on Wednesday, said a statements on the SOA website.

The vessel will soon begin its patrol mission in the East China Sea to safeguard the country's sovereignty, the statement said.

Haijian 110 joined the CMS Beihai fleet and started its patrol mission in the Yellow Sea on Monday, said another statement on the SOA website.

The agency has more than 400 law enforcement vessels now.

According to the SOA, several more vessels will be commissioned in near future to meet the needs of law enforcement and sovereignty patrols.