Police are on the search for a pair of suspects involved in the shooting of a police officer in Ferguson, Mo., which occurred around 9:10 EST Saturday night. Local news station KSDK says the officer—whose identity hasn't been released—was shot in the arm and is still alive. 

That happened only hours before an off-duty St. Louis police officer's car was shot up.

A Vine posted by user DeRay Mckesson (above) shows a massive amount of police vehicles moving down a Ferguson street.

Speaking at a news conference this morning, St. Louis County Police Chief Jon Belmar said he did not believe the shooting had anything to do with two protests over Michael Brown's shooting that were happening last night, ABC news reports.

According to a news release from police, the officer was on patrol when he spotted a man behind the Ferguson Community Center. When the officer got out of his cruiser to find out why the man was there, the man ran, and a foot chase started, police said. During that chase, police say the man spun around and fired at the officer with a handgun, hitting him once in the left arm.

Police said the officer fired back, but it doesn't appear that he hit anyone. On Sunday, Belmar confirmed that police were searching for two suspects who ran from behind the community center, one who fired shots. 

Then, shortly after midnight, St. Louis County police received another shooting call, this one involving an off-duty officer. The officer was driving on Interstate 70 when a vehicle pulled up beside him and and multiple people began firing at him with handguns, according to the police news release.

The officer, who was not identified, suffered only minor injuries from broken glass, police said. 

Police said it's unclear if the officer was targeted or was the victim of random violence. He was not in uniform (except for his pants, for some reason) at the time of the shooting, police said.