A fleet of four Chinese marine surveillance ships continued to patrol territorial waters off China's Diaoyu Islands Monday, according to the State Oceanic Administration (SOA).

The vessels are Haijian 51, Haijian 26, Haijian 66 and Haijian 137, the SOA said in a statement.

The statement comes exactly a week after the previous SOA briefing on the patrols in the area.