WASHINGTON (REUTERS) - President Donald Trump said on Thursday (June 1) that the United States was closely monitoring what he described as a terrorist attack in Manila.

"We're closely monitoring the situation but it is really very sad as to what's going on in the world with terror," Mr Trump said at a White House ceremony where he announced the United States would withdraw from a landmark 2015 global agreement to fight climate change.

"Our thoughts and our prayers are with all of those affected," he added.

Gunshots rang out from an entertainment resort in the Philippine capital, Manila, early on Friday and local media reported armed men were inside the complex.

A spokesman for the US State Department said it was not aware of any US citizens being affected, but was continuing to gather information.