How the UK and US helped us nab alleged Sydney terror cell

Image: Khaled Khayat is one of four men in police custody. None of the men have been charged.

A tip-off from British and US intelligence agencies helped police thwart a terror plot to bring down a passenger plane.

Police are believed to have swooped on five properties across Sydney after allied intelligence agencies alerted them to the threat.

A father and son are among four men in custody.

Charges are yet to be laid as they’re questioned about alleged plans to use a homemade device to either bomb or gas hundreds of people on flight, believed to be Dubai-bound.

It’s understood one of the men is the brother of a senior ISIS figure.

Meanwhile, it’s been revealed, the son of one of the men had studied aviation management and socialised with pilots and airline workers.

Officials are keeping tightlipped on details of he investigation but the Prime Minister says the alleged plot was advanced.