A Buffalo police officer remains in critical condition Friday after a car he was chasing Thursday afternoon struck a light pole that fell onto the police car, hitting the officer and leaving him unconscious.

The officer is 29-year-old Jonathan Negron, who has been on the force for two years. Negron was being treated at ECMC’s Trauma Intensive Care Unit with severe head trauma. Buffalo Police Benevolent Association President John Evans told WIVB. Negron has a fiancée and infant son.

BPD said officers were responding to a call of a white vehicle with four suspects inside with a gun at 12:58 p.m. The officer tried to stop the vehicle and a chase began around 1:01 p.m. The vehicle went off the road into a cemetery. The vehicle exited the cemetery and crossed the road, hitting a light pole.

The four suspects were taken into custody.