The China Coast Guard has said that it expelled on Saturday two repair ships and two coast guard ships from the Philippines that trespassed China's territorial waters near Ren'ai Jiao, part of the Nansha Islands in the South China Sea.

The China Coast Guard has implemented necessary controls in accordance with the law and stopped Philippine ships carrying illegal building materials, a spokesperson for the China Coast Guard said in a statement.

"We urge the Philippine side to immediately stop its infringing activities in this waters", the spokesperson said, adding that China has indisputable sovereignty over the Nansha Islands and their adjacent waters including Ren'ai Jiao.

"The China Coast Guard will continue to carry out law enforcement activities in waters under China's jurisdiction according to law," the spokesperson said.