CLEVELAND -- Chief Calvin Williams unveiled a new police pursuit policy during a news conference.

According to Chief Williams, the revised policy sets clear definitions and restrictions for all officers involved in a pursuit as well as limits conditions under which a chase can be utilized.

The policy also sets a clear chain of command, with a supervisor solely tasked with handling the pursuit. The policy only allows for two zone cars to be involved in a chase unless the supervisor handling the incident can clearly define why additional officers are needed.

Williams says the chase policy revision has been in the works for a year-and-a-half. He says the department's policies are continually updated.

This new policy revision announcement comes more than 15 months after a chase involving more than 100 officers and 60 squad cars ended in the deaths of two people.

The chase culminated in a shooting during which 137 shots were fired at the car's occupants, Timothy Russell and Malissa Williams.

A grand jury is hearing evidence to determine whether any of the officers that fired shots during the Nov. 12, 2012, chase and shooting should be charged.

The police union says officers used force to confront the driver who was trying to ram them.

An investigation by the Ohio attorney general blamed police leadership and communication failures in the chase.