Police allege Mr Pusey took photos of the scene before leaving on foot and then sharing the graphic images with friends. Chief Commissioner Graham Ashton said the graphic pictures taken by the driver were shared with some of Mr Pusey's friends and later appeared on Facebook. Mr Ashton urged members of the public not to share them. "We believe ... that he has taken some photographs of the scene and then taken off on foot and until we speak to him today we won't know what else he has done since that time," Mr Ashton said. "He stayed [at the scene] for a very short amount of time.

"We made contact with him last night ... he was communicating with friends and showing the photos and ... we believe they were on Facebook earlier so we are trying to get them removed from Facebook." Loading Replay Replay video Play video Play video Mr Ashton said the Porsche was not stolen. In a statement on Thursday, a police spokesman said investigators were keen to thank the public for the "significant number of calls to Crime Stoppers in relation to the whereabouts of this person".

Mr Ashton described the alleged actions of the driver as "disgusting". Loading "I don't want to pre-empt the interview with this fella, and what might flow from that. It's an indictable offence to leave the scene of an accident. So we need to work through that and understand his knowledge and involvement as part of an investigation of that," he said. "Today, when I'm spending time with the family members of those deceased officers, I can tell you it will absolutely disgust them. To leave the scene is a very, very low act in my view. "If I wasn't wearing this uniform as Chief Commissioner I'd be giving you far more colourful language on that."

Dashcam footage has also surfaced of a black Porsche with the same number plates allegedly speeding on the Eastern Freeway on March 21. A black Porsche (left) can be seen in the video speeding down the Eastern freeway. Credit:Facebook Mr Ashton could not confirm the Porsche in the dashcam footage was the car involved in Wednesday's crash, but he said "it looks pretty similar" and the video would form part of their investigation. He said the driver of the semi-trailer involved was still in medical care and police hoped to interview him on Thursday. Police searched the truck driver's Cranbourne home overnight. "What was found there is still the subject of ongoing investigation," Mr Ashton said.

Loading The site of the crash remains an active crime scene. The bodies of the police officers were set to be removed under police escort on Thursday morning. Those who died included a senior constable in his 60s, an officer who was a father and had been with police for eight years, a recent graduate and a trainee officer still studying at the academy. Their family members were still being notified on Thursday morning. The crash scene on Wednesday night. Credit:Nine News

Mr Ashton said police pulled over the Porsche 911 on the Eastern Freeway inbound stopping lane at 4.50pm on Wednesday. Police spoke to the driver and a fluid test was conducted, returning a positive result for drugs. Officers decided to impound the vehicle and called for support from highway patrol. "Around about 5.40pm ... a truck, a refrigerated semi, has come along that freeway. It is still quite early in the investigation to describe exactly the movements of that vehicle," Mr Ashton said. One of the police cars being removed from the scene on Thursday morning. Credit:Eddie Jim "The truck itself appears to have moved from one of the traffic lanes in the freeway into the emergency lane and has travelled a short distance in the emergency lane at around about 100km/h and slammed into the rear of the highway patrol vehicle."

One of the police cars spun across into the centre of the freeway and the Porsche has wound up underneath the front of the truck. "The driver of the truck has had a medical episode immediately following the accident which seemed to involve him blacking out. Ambulances attended, obviously, to attend to the situation," he said. Premier Daniel Andrews described the crash as a "terrible tragedy". "Today I ask all Victorians to pause and honour every single member of Victoria Police for the work they do and service they offer," the Premier said. "To live a life in the service of others is a deeply impressive thing. To lose your life in the service and protection of others is a tragedy."