China has rejected US charges that it has expanded its outposts in the South China Sea.

Foreign Ministry spokesperson Hong Lei said at a daily news briefing on Friday that China's activities in its own territory are legitimate and justified.

He said China has shown restraint and a responsible attitude in the South China Sea.

The spokesman urged the United States to honor its commitments, and do more to contribute to China-US relations and regional peace and stability.

Earlier, US intelligence chief James Clapper reportedly said China is expanding its outposts in  South China Sea to include stations for ships and potential airfields.

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