Two Metropolitan Police cars were involved in a four-vehicle collision during an operation in St Albans, at about 5pm yesterday (Wednesday).

Herts Advertiser: An investigation has been launched following the collision in St AlbansAn investigation has been launched following the collision in St Albans (Image: Photo supplied)

A spokeswoman for Herts Police said that the collision occurred in Bluehouse Hill (A4147) and that one person – not an officer – was slightly injured and went to hospital as a precaution.

While details of the incident are sketchy, a press officer for the Met Police said the collision occurred during an operation, but she could not confirm whether it was while officers were in pursuit of a vehicle in the area.

She said the Met’s Collision Investigation Unit is looking into the crash.

A passing motorist told the Herts Advertiser: “I saw a lady with a dog, which was being put in the back of an unmarked police car. Police were going from the scene with blue lights going.

“I could also see three dented vehicles, one of which was facing the wrong way.”