The driver of a Chevrolet Equinox SUV at fault in a dramatic Back Bay crash that involved nearly a dozen cars and injured four firefighters in October was driving for ride-for-hire company Lyft, the company said.

The SUV driver, who has not been identified, was working as a Lyft driver at the time of the crash, the company said, but did not have a passenger in the car. Lyft said the man has been suspended while the company investigates the incident.

The driver was cited on scene for failing to stop for an emergency vehicle.

On Oct. 31, the driver sped through a red light and hit an oncoming fire engine. The driver told police he thought the sirens were behind him, so he pulled into the intersection to try to get out of the way.

Instead, the engine ­truck — lights and sirens blaring — smashed into the driver’s Chevy. That set off a chain reaction, damaging 11 cars. A large tree and a portion of the sidewalk was also destroyed.

The fire truck was on its way to a report of smoke at 11 Boylston St. just before 11:30 a.m., traveling west on Commonwealth Avenue.

Lyft carries different levels of insurance for its drivers depending on if they have a passenger in the car. Because there was no passenger and the driver was not on his way to pick one up, Lyft’s insurance will cover a maximum of $100,000 per accident.

The state department of public utilities is still crafting regulations after Gov. Charlie Baker signed a law regulating companies like Uber and Lyft. The law requires the same level of insurance as Lyft currently carries.