As a St. Louis police officer recovers from having his leg partially amputated after being struck by a car Monday morning , city prosecutors have announced charges against two of the drivers involved in that incident.

The St. Louis Circuit Attorney’s Office charged Mehki R. Campbell, 18, of East St. Louis, with first-degree assault, armed criminal action, aggravated fleeing a stop, and resisting arrest, Fox 2 reports.

Frank Carr, 62, of St. Louis, was charged with two counts of leaving the scene of an accident – physical injury and one count of tampering with physical evidence.

The incident reportedly began with a carjacking of a Toyota Rav 4.

The officer who was injured in the crash was struck by another vehicle while holding one of the carjacking suspects at gunpoint.

They when they both were struck by an oncoming Cadillac, Chief Robert Tracy said.

The injured officer fired what Chief Tracy called “safety shots” to alert nearby officers to his presence. Other officers responded and immediately began to administer first aid to their injured colleague and the suspect.

The officer was rushed to the hospital in a police vehicle . The injured suspect was taken to another hospital.

After reviewing surveillance video showing the Cadillac flee the scene, police ran the vehicle’s plates and saw it was registered to Carr. Police later located and arrested Carr.