Gun violence erupted across Baton Rouge on Saturday as authorities investigated four separate and unrelated shootings in the city, two of which were fatal.

The violence began at 8:15 a.m. when, police say, a man was shot several times by a suspect during a fight over a previous drug deal.

Authorities arrested Desmond Sanders after witnesses said he shot Trevor Washington, 23, several times in the torso, said Baton Rouge police spokesman Cpl. Don Coppola.

Washington was taken to an area hospital, where he died of his injuries, police said.

Sanders, 1197 N. Acadian E. Thruway, Baton Rouge, was booked into Parish Prison on counts of second-degree murder and illegal use of a weapon.

A few hours later, just before noon, officers responded to the fatal shooting of a 16-year-old boy, Coppola said.

David Edwards Jr., 17, was playing with a gun when the weapon fired and hit his friend Robert Thomas in the torso, Coppola said. Thomas was treated at a local hospital and died shortly after, Coppola said.

Edwards, 5846 S. Sunset Hill Ave., Baton Rouge, was booked into Parish Prison on a count of negligent homicide.

Another shooting happened about 12:30 p.m., when an officer fired a single shot after a fleeing car crashed and a passenger emerged, pointing a gun toward officers.

Two officers were trying to stop a vehicle near 1800 Bay St. when the driver, Jacob Washington, 21, refused to stop, Coppola said.

When Robinson later crashed while turning at Plank Road and Bellvale Street, the passenger got out of the car and pointed a gun at officers, Coppola said.

Police arrested the driver without incident, Coppola said.

He said he did not know if the fleeing suspect was struck by any bullets fired by the police officer.

Washington, 5375 Fairfields Ave., Baton Rouge, was booked into Parish Prison on counts of aggravated flight from an officer, careless operation of a motor vehicle and other traffic violations.

A fourth, nonfatal shooting happened Saturday, Coppola said. The victim is expected to survive, Coppola said. Additional details about where and when the incident happened were not available late Saturday.

Follow Matt McKinney on Twitter, @Mmckinne17.