BALCH SPRINGS, Texas >> Police in suburban Dallas fired the officer today who shot and killed a black 15-year-old boy riding in a vehicle leaving a chaotic house party, taking the swift action sought by the teenager’s family and protesters who link the case to other deaths of African-Americans at the hands of law enforcement.

The Balch Springs, Texas, officer, identified as Roy Oliver, was terminated for violating department policies in the shooting death of Jordan Edwards, police chief Jonathan Haber said.

Edwards, a high school freshman, was leaving the party with his two brothers and two other teenagers Saturday night. Police arrived at the scene to investigate an underage drinking complaint and spotted the vehicle leaving. Oliver opened fire as the teenagers were driving away.

Shots from his rifle pierced the front side passenger window, hitting Edwards in the front seat, according to Edwards’ family attorneys, Lee Merritt and Jasmine Crockett. His 16-year-old brother was driving.

Haber said Oliver, who joined the department in 2011, had committed “several” violations of policy, but wouldn’t say what they were because Oliver is entitled to appeal his firing. The Dallas County district attorney and the Dallas County sheriff’s office are investigating the case. The race of the fired officer was not revealed.

Police originally said the teenagers’ vehicle was reversing “in an aggressive manner” toward officers, but Haber said Monday that video taken at the scene proved the vehicle was actually driving away.

The police department’s latest statement, released tonight, says officers entering the house heard gunshots ring out during a “chaotic scene with numerous people running away from the location.” As officers exited the house, they encountered the vehicle backing out onto a main road and driving away despite their attempts to tell the driver to stop, the new statement said.

The Dallas County medical examiner ruled Edwards’ death a homicide.

Thousands of Facebook and Twitter users have posted about the case in recent days with the hashtag “#jordanedwards,” some comparing his death to other police shootings of young black men, such as 12-year-old Tamir Rice in Cleveland, who was fatally shot in November 2014 as he held a pellet gun.

Edwards’ family had called for the officer to be fired and criminally charged. Both Merritt and Crockett have credited Haber for correcting the mistaken statement and moving quickly to fire Oliver.

“No other city has moved at the rate Balch Springs has,” Crockett told The Associated Press tonight. “It’s just unbelievable. It’s absolutely unbelievable that a department did what a department should do.”

But a family statement released tonight called for disciplinary action against other officers who “extended this nightmare for those children.”

“Our family is working hard to deal with both the loss of our beloved Jordan and the lingering trauma it has caused our boys,” the family statement said.

Cindy Stormer, an attorney for Oliver, issued a statement saying the shooting was “recent and still being investigated.”

“Everyone should wait until the facts come out and we know more,” she said, according to the Dallas Morning News.

Friends have described Edwards as a good student and popular athlete. Edwards and the four people with him decided to leave what was becoming an unruly party as they heard gunfire and police were arriving, Merritt said, citing what witnesses had told lawyers.

As they drove away from the party, Crockett said, the brother driving the vehicle heard multiple gunshots that were close enough to leave his ears ringing. It took a few moments before the people inside in the car noticed Edwards slumped over, she said. They couldn’t tell if he was already dead.

The brother who was driving pulled over and tried to motion to police for help, she said. Instead, Crockett said, he was detained and handcuffed. Crockett said the driver wasn’t formally arrested, but a separate statement from the family released through Merritt says the two brothers were arrested.

Based on what the video captured, Haber said previously that he questioned whether what he saw was “consistent with the policies and core values” of his department. Haber wouldn’t say what problems he saw, but Balch Springs’ official use-of-force policy encourages officers facing an oncoming vehicle to “attempt to move out of its path, if possible, instead of discharging a firearm at it or any of its occupants.” The video has not been released.