Counter-terrorism police in Australia have stopped a suspected terror plot to bring down an aeroplane, Prime Minister Malcolm Turnbull has said.
He was speaking after four people were arrested in raids across Sydney, the BBC reports.
Australian Federal Police Commissioner Andrew Colvin said the four men arrested were allegedly linked to a Islamist-inspired plot.
Investigators said they had seized materials in the raids that could have been used to make an improvised explosive device.
Mr Turnbull said the raids had been a "major joint counter-terrorism operation".
He said extra security was in place at domestic and international airports.
The raids took place in the Sydney suburbs of Surry Hills, Lakemba, Wiley Park and Punchbowl, Australian broadcaster ABC reported.
Australia's national terror threat level remains at "probable".
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