Police from the joint counter-terrorism unit have arrested a 24-year-old male when they intercepted him at a traffic stop in Sydney’s south-west.

Police have arrested two people in Sydney’s west this morning over alleged foreign incursion offences as authorities raid homes in Sydney’s south-west.

A 24-year-old man was arrested during a traffic stop in Birrong.

Police have told 9NEWS the man is allegedly an ISIS fighter who fought for the Free Syria army in 2013 and is trained in the use of IEDs.

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Authorities described the man as “very dangerous”.

He is expected to be charged with foreign incursion offences later today.

A 24-year-old man has been arrested by police as the joint counter terrorism team continues raids part of a high-risk operation in Sydney’s south-west.

The man was allegedly convinced to join ISIS by convicted terrorism recruiter Hamdi Alqudsi who is serving six years in jail for sending seven men to fight in Syria.

A second person is also understood to have been arrested.

A large police operation is now underway following the arrests, with authorities raiding several homes suspected of being connected to terror activity.

The high risk operation is being carried out by the joint counter-terrorism team.