Victorian police have been given orders to use lethal force on drivers who attack pedestrians.

Officers have been authorised to shoot to kill in order to stop vehicles being used as deadly weapons after the Bourke Street rampage two years ago.

The authorisation of a new “hostile vehicle” policy was outlined in an email sent to Victorian police officers.

Deputy commissioner Shane Patton said, “the thrust is to give our members clarity. We know hostile vehicle incidents can escalate quickly and there is a very real threat that people can be killed or seriously injured.”