VICTORIA'S police chief says he's worried about how often his officers are shooting at fleeing drivers after another incident in which a policeman shot at a car in Melbourne. An officer fired two shots at a speeding hoon on Tuesday night as police were trying to break up an unauthorised gathering of 100 car enthusiasts at a factory car park in the city's far south. In the latest shooting, a highway patrol constable was in plain clothes to follow up on reports a Carrum Downs revhead event had been organised, then called for back-up when the first cars arrived. Police say the officer had been walking towards one of the vehicles around 10.30pm (AEDT) when it rapidly accelerated, forcing him to dive for cover. He fired two shots in fear of his life but missed. Police are now reviewing whether operations of that type are too risky and need to be altered. Assistant Commissioner Luke Cornelius, who is in charge of policing in the area, said it was important to not only examine the officer's actions, but see if anything more could be done so future police operations don't place officers in the path of a fleeing car. "This is an issue about safety," he told reporters. There's always room for improvement. The force's professional standards unit is also involved in the investigation because a firearm was discharged.