Four people were injured in a Sunday morning crash involving an unmarked RCMP cruiser in Langley.
The police watchdog agency, the Independent Investigations Office (IIO) is investigating.
According to the RCMP, on June 23, at approximately 2:01 a.m., officers in Langley were responding to a complaint and were travelling southbound on 200 Street.
The unmarked police vehicle collided with a civilian vehicle that reportedly pulled out of Brydon Crescent.
The driver of the civilian vehicle suffered serious injuries and was transported to hospital.
Two passengers as well as an RCMP officer were also taken to hospital with injuries.
The IIO was notified at 2:53 a.m.; four IIO investigators were called in.
On Monday, the IIO said the 35-year-old driver remains in hospital with serious injuries. But his 33-year-old passenger has been treated and released from hospital.
The officer involved was also treated in hospital and has since been released.