BOSTON — The Massachusetts attorney general's office has opened an investigation into the trucking company that employed the driver charged in the deaths of seven motorcyclists in New Hampshire.

A spokeswoman for Attorney General Maura Healey confirmed Tuesday an investigation into Westfield Transport Inc. She couldn't comment further because the probe is ongoing.

The 23-year-old driver, Volodymyr Zhukovskyy, of West Springfield, Massachusetts, has pleaded not guilty to negligent homicide in connection with the June 21 crash in New Hampshire.

Officials say Zhukovskyy's license should have been suspended because of a drunken driving arrest in Connecticut.

A man who answered a phone number listed for Westfield Transport said the company does not exist anymore before hanging up. He did not identify himself. The owner previously said he is cooperating with investigators.