CLEVELAND —  Cleveland Police Chief Mark McGrath announced this week that, following an 11-month investigation, his office will issue suspensions for 63 of the 104 officers involved in a 25-minute high-speed car chase that resulted in the fatal shooting of the driver and his passenger.

The officers will serve suspensions totaling 178 days, with the longest suspension being 10 days. The officers are being disciplined because of excessive speed, insubordination and failure to request permission to join the pursuit, McGrath said.

On November 29, 2012, Timothy Russell and Malissa Williams fled a traffic stop and led police on a chase that ended with 13 officers firing 137 rounds at the car Russell was driving. The chase involved 63 police cars, according to the investigation.

The 13 officers directly involved in the shooting of Russell and Williams were not among those suspended and still may face discipline and possible criminal charges.

McGrath said many of the officers involved told the investigation they joined the chase because they thought Russell and Williams were shooting at police.

They also thought Williams, the passenger, had a weapon in her hand during the chase, according to the investigation. Nine Cleveland police department supervisors were suspended, two demoted and one was fired, due to the way they handled the incident, McGrath said.