BEIJING (REUTERS) - China said on Monday it was seriously concerned about any unilateral military action against Syria after US President Barack Obama delayed a military response to last month's chemical weapons attack near Damascus until after a congressional vote.

The United States has explained to China its evidence on chemical weapons use in Syria, China's Foreign Ministry spokesman Hong Lei said at a daily news briefing.

China has said that no side should rush to pre-judge the results of an investigation by UN chemical weapons experts in Syria, who it said should carry out an objective and impartial investigation in consultation with the Syrian government.