US President Donald Trump has signalled new action against left-wing groups following the assassination of right-wing political activist Charlie Kirk, targeting the anti-fascist Antifa movement as a "terrorist organisation".

Trump said on his Truth Social platform he was "designating" the movement as a terrorist organisation.

"I will also be strongly recommending that those funding ANTIFA be thoroughly investigated in accordance with the highest legal standards and practices," Trump wrote.

It was not clear what legal weight Trump's proclamation carried. Antifa, short for "anti-fascists", is a loosely organised ideological movement without a clear leadership structure or hierarchy, experts said.

A day after Utah prosecutors unveiled formal charges against the suspect in the assassinatio

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