WASHINGTON (Reuters) - The senior U.S. defence official for Asia said on Tuesday that the United States has some concerns about some of the tactics used by demonstrators in Hong Kong but was also concerned about the heavier hand Beijing and Hong Kong authorities have used against protests in the territory.

Randall Schriver, the assistant secretary of defence for Indo-Pacific Security Affairs, said the United States was "100 percent" behind those in Hong Kong who were speaking out for respect for fundamental rights guaranteed in the 1984 Sino-British Joint Declaration.