LONDON -- British Prime Minister Keir Starmer said that Britain was "not involved in any way" in the US operation in Venezuela, according to British media reports on Saturday.

In remarks recorded for British broadcasters, Starmer said he had not spoken to US President Donald Trump about Washington's capture of Venezuelan President Nicolas Maduro.

"It is obviously a fast-moving situation and we need to establish all the facts," he said, adding that he is seeking more information before making further comment.

Starmer said there were about 500 British nationals in Venezuela, and that the government was working with the embassy to ensure they were well looked after, safeguarded and given appropriate advice.

US President Donald Trump said on Saturday that the United States has struck Venezuela and captured its President Nicolas Maduro, who was flown out of the country along with his wife.

Venezuela on Saturday denounced a "military aggression" by the United States, after large explosions were heard and aircraft were seen over the capital Caracas earlier in the day.