Four members of Scott Morrison's security team have been rushed to hospital after their car collided with another vehicle in Tasmania.
The vehicle rolled down an embankment off the Bass Highway on Thursday afternoon during the crash, believed to have occured when the other vehicle attempted to merge.
The collision occurred just outside of Elizabeth Town on the way to Devonport. It is about half way between Launceston and Devonport.
Mr Morrison was not involved in the accident, and no-one has been killed.
The two vehicles were travelling in the same direction, and Tasmania Police confirmed it was investigating the crash.
"Circumstances surrounding the crash are being investigated, however initial enquiries indicate that the Triton has collided with the rear of the police vehicle, while attempting to merge," its statement said.
"Four police officers (a man and a woman from AFP, and two men from Tasmania Police) received non-life-threatening injuries, after their vehicle rolled down an embankment.
"As is normal process for a crash involving police, the Tasmania Police Professional Standards Unit has been advised and will monitor the investigation."
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Mr Morrison described the accident as "terrible" and said he was relieved the officers had been transferred to hospital.
The driver of the other vehicle - a Mitsubishi Triton - was uninjured.
Paramedics and Tasmanian Police had slowed traffic when responding to the incident and had pulled the victims from the crash.
The use of oxygen and other medical equipment could be seen from the road.
A spokesperson for Mr Morrison said four police officers were conscious when they were transferred.
"Family members of the officers have been contacted and are being kept informed of their condition," they said.
"The PM is always extremely grateful for the protection provided by his security team and extends his best wishes for their recovery and to their families."
The collision occurred as Mr Morrison travelled to Burnie for a defence industries event as part of the federal election campaign.
The Prime Minister had been travelling from an event in Longford earlier in the day.
The event has been cancelled, with Mr Morrison's entourage and the trailing press pack redirected to the airport.
All campaigning events have been cancelled for the remainder of the day.
Anthony Albanese tweeted is best wishes to the four injured officers.
"They do a fantastic job and I wish all a speedy recovery," he said
Home Affairs Minister Karen Andrews wished the four officers a speedy recovery.
"They were on duty, providing protection to the Prime Minister. My thoughts are with them and their families, and I thank them for their service," she tweeted.
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