U.S. President Donald Trump on Tuesday, citing U.S. intelligence, said China's government was moving troops to its border with Hong Kong and he urged calm as clashes continued between protesters and authorities in the former British colony.

It was not immediately clear if Trump was reporting fresh movements or movements near the border already reported in the media. "Our Intelligence has informed us that the Chinese Government is moving troops to the Border with Hong Kong. Everyone should be calm and safe!" he tweeted.