Shocking video captures a male sneaking up to a convenience store entrance before unloading his gun and killing three teenagers

A shocking surveillance video captured a triple homicide at a Texas convenience store and showed how the shooter snuck up to the entrance to surprise his targets.

The alarming incident unfolded in the city of Garland on Sunday.

The video shows the shirtless young male slowly stalking toward the door and then pulling out his gun and shooting at four teenagers. Three of the victims died while another was seriously wounded.

Police said the man got into a white pickup truck that sped away after the shooting. They said there were as many as 40 rounds fired by the suspect.

The three victims that died were aged 14, 16, and 17. The fourth victim was 15 years old and was taken to a hospital in critical condition.

Later, Garland Police said they had apprehended a 14-year-old suspect in the shooting, but they released him and said that the shooter was still at large.

“Now he still remains a person of interest, but there is information that leads to believe someone else may have pulled the trigger,” said Garland Police spokesperson Lt. Pedro Barineau according to KTVT-TV.

On Monday, 33-year-old Richard Acosta turned himself in to the police and was charged with capital murder of three persons. Police believe that Acosta was the driver of the truck.

“We now believe that one or more of the victims who were shot inside the were involved in a previous disturbance with which, what believe to be the shooter who pulled the trigger,” added Lt. Barineau.

Fatima Macedonio, a cousin of one of the victims who died, spoke to KTVT about the crime.

“You’re just speechless and then my Uncle saw it, my grandma was here she heard the shots and I just don’t know how somebody has that heart to put a family through all of that,” said Macedonio.

Acosta was held on $1,000,000 bail.

Here's a local news report about the harrowing incident:

Garland Police Arrest 14-Year-Old In Connection With Triple Murder At Convenience Storewww.youtube.com