Four on-duty police officers have been killed in a vehicle collision in Kew Victoria tonight.

The multi-vehicle collision occurred inbound on the Eastern Freeway near Chandler Highway just after 5.30pm.

The exact circumstances surrounding the collision are still to be determined.

Detectives from the Major Collision Investigation Unit are currently at the scene and are investigating.

A male truck driver has been taken to hospital with non-life-threatening injuries.

Motorists are asked to avoid the area as the road will be closed for some time.

Anyone who witnessed the incident or with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au

Danial Andrews: Tonight, four police officers lost their lives in the line of duty.

And tonight, somewhere in our city, four families’ hearts are breaking.

Our hearts are breaking with them.

We grieve alongside them – just as we grieve with every member of Victoria Police and every member of our emergency services family.

In the coming days, formal investigations will tell us why – how – this could possibly have happened.

But one thing is already clear:

Though we may not yet know their names – we will always call them heroes.