Homicide detectives have arrested a man at Sydney International Airport over the shooting murder of prominent Vietnamese lawyer Ho Le Dinh at a Bankstown cafe last month.

The 38-year-old man was boarding a plane for Bali when he was arrested by investigators from Strike Force Eugene this morning.

The ABC has been told police moved in when the man’s passport triggered an alert at Customs.

He has been taken to Mascot Police Station where he is being questioned over the shooting at the Happy Cup Cafe.

Mr Ho, aged in his 60s, died on the side of a Bankstown Road, after being shot several times about 3.40pm on January 23 in what police described as a “targeted attack”.

Witnesses described hearing at least three gunshots and saw a man running away down nearby Stewart Lane.

It is unclear what charges the man will face, but he is expected to appear in court later today.

CCTV footage from a business nearby showed the alleged killer wearing a baseball cap and fluorescent shirt with a dull green jacket over the top.