BROCKTON — Four Massachusetts State Police troopers and a civilian have been injured in a chain reaction crash caused by a suspected drunken driver.

Agency spokesman David Procopio says the troopers were in two cruisers conducting a traffic stop on Route 27 in Brockton at about 1 a.m. Monday.

The suspect struck the back of one cruiser, pushing it into the second, which was pushed into the pulled-over vehicle.

The injured went to the hospital where they were treated and released.

The troopers were two field training officers and two June graduates of the state police academy. Their names weren't released.

Frandy Jose Ramirez Rodriguez of Brockton faces arraignment Monday on several charges including driving under the influence of alcohol and driving after a license suspension. It wasn't known if he has a lawyer.