Australian leaders have condemned the assassination of a key ally of US President Donald Trump, saying political violence is never acceptable.

Conservative activist Charlie Kirk was killed while speaking at the event at Utah Valley University in Orem, south of Salt Lake City, on Wednesday, US time.

Acting Prime Minister Richard Marles said his thoughts went out to Mr Kirk's family.

"There is absolutely no place for political violence," he told ABC TV on Thursday.

"That's the message that we have to take from this... that is not a way in which to resolve arguments and disputes and discussions in society."

Liberal senator James Paterson echoed Mr Marles' comments, noting that the shooting follows an attempt on US President Donald Trump's life in 2024.

"It does seem that there has been

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