Gunmen on the run after Sydney execution

The home where an underworld figure was gunned down in Sydney's southwest remains a crime scene.

At least two suspects remain on the run after Hamad Assaad, 29, was executed in the targeted attack at Georges Hall on Tuesday morning.

Police believe the gunmen waited for Mr Assaad to emerge from the house before shooting him and speeding off in a black Audi sedan, with investigators are now looking for.

Police remain at the suburban home on Sturt Avenue on Wednesday.

Mr Assaad was a key suspect in the execution of standover man Walid Ahmad at a Bankstown shopping centre in April.

That murder was thought to be in retaliation for the shooting homicide of Safwan Charbaji outside a nearby panel beater two weeks earlier.

Six years ago, Mr Assaad was acquitted of murdering Mohamad Alahmad, who was shot dead at his Granville home in 2007.

The slain man's mother was inside the family home during Tuesday's shooting, and his body remained covered in the driveway for several hours as police swarmed the scene and loved ones gathered nearby.