BEIJING - A Foreign Ministry spokesman on Monday urged the Philippines not to complicate the situation in the South China Sea, as recent media reports have stated that the country may build infrastructure on the Nansha Islands.

"We have seen the reports and will closely watch the development of the situation," spokesman Hong Lei said during a regular news briefing.

Hong said China has indisputable sovereignty over the Nansha Islands and their adjacent waters and opposes any move that could impair China's sovereignty.

"We hope the country concerned will adhere to the Declaration on the Conduct of Parties in the South China Sea (DOC) and not take any action that could complicate the issue," he said.