An elderly man and two police officers have been injured after their cars collided in Melbourne's northwest.
The officers were attending the scene of a crash when they collided with another car at St Albans after 10pm (AEDT) on Thursday.
The 74-year-old driver of the other car was taken to the Royal Melbourne Hospital for observation and returned a positive preliminary breath test, police said.
The two male officers suffered minor injuries with one taken to hospital for observation.
An investigation is underway.