Car number plates owned by men connected to the Brothers 4 Life gang will be cancelled because they appear to mock the state's most senior detectives.

In the early hours of yesterday morning Mahmoud Hamzy was shot dead at a Revesby home.

The 25-year-old was the cousin of high security prisoner Bassam Hamzy, who founded the Brothers for Life gang.

Two cars that arrived at the crime scene yesterday had number plates with the letters MEOC.

That is the acronym used by the police branch that investigates the gang, the Middle Eastern Organised Crime squad.

Police have issued a statement saying they have applied to the Roads and Maritime Service (RMS) demanding that a range of number plates including those with MEOC or variations of the acronym be deemed unsuitable.

The RMS has agreed and is in the process of advising the owners that their plates are being cancelled.

Meanwhile a second man who was also shot in yesterday's attack remains in hospital.