NBC News - Three people have been charged over the fatal shooting of two police officers during a traffic stop in the southern Mississippi city of Hattiesburg on Saturday night, authorities said.

The officers, Benjamin J. Deen, 34, and Liquori Tate, 25, were gunned down after one of them pulled over a Hyundai for a speeding violation, according to Warren Strain, a spokesman for the Mississippi Department of Public Safety.

He said the shooting occurred after one of the officers arrived on the scene to help his colleague. He said it was unclear at this stage who was the first officer on the scene.

Three suspects, including two brothers, were arrested in different locations after a manhunt that lasted into the early hours of Sunday morning, Strain said.

Marvin Banks, 29, was charged with two counts of capital murder, grand theft auto, and a felon in possession of a firearm; Joanie Calloway, 22, was charged with two counts of capital murder; and Curtis Banks, 26, was charged with accessory after the fact of capital murder.

The suspects fled after the incident, Strain said, with Marvin Banks alleged to have absconded in one of the officer's vehicles.

He said it was unclear at this stage how the shooting incident unfolded.

"We're piecing all that together at this point. There's still a good bit of investigating to do — there are several pieces of the puzzle that we need to bring together to bring clarity to what has happened here," he said.

The officers were transported to the Forrest General Hospital, where they were pronounced dead, Strain said. He said Deen was a K9 handler, while Tate had been on the force for less than a year.

Local newspaper The Jackson Clarion-Ledger reported that the officers were the first Hattiesburg cops to die in the line of duty in 30 years.