Updated

A man suspected of wounding a police officer and two bystanders when he opened fire from the platform of a suburban Dallas transit station was found shot to death Tuesday after exchanging gunfire with other officers who pursued him, authorities said.

The man died of a gunshot wound to the head, but it wasn't immediately clear whether the officers killed him or he shot himself, Richardson police Sgt. Kevin Perlich said.

The incident happened about 3:30 p.m. Tuesday at a Dallas Area Rapid Transit "Red Line" train station in Richardson, DART spokesman Mark Ball said.

The driver of a DART bus told a transit police officer at the station that a man who had just boarded was being disorderly, Perlich said. The man, who was walking toward a waiting DART train, opened fire when the officer confronted him.

After the transit officer returned fire, the man fled to a nearby warehouse, where he exchanged fire with other officers who pursued him. That's where he was found dead, Perlich said.

One bystander suffered life-threatening wounds and required cardiopulmonary resuscitation at the scene, fire chief Alan Palomba said. Injuries to the officer and the other bystander weren't considered life-threatening.

It was the latest in a string of violent incidents reported recently at DART stations.

Last month, a man was shot to death during an argument with three people at a station in downtown Dallas.

In December, undercover Dallas police officers shot and killed a suspect who they say brandished a handgun aboard an Amtrak train stopped at Union Station in Dallas, the hub of DART's rail network. An officer and a bystander were wounded.

A few weeks earlier, four juveniles were arrested and charged with murder after a 19-year-old man was shoved against an accelerating DART train at a platform near Fair Park, southeast of downtown Dallas.