A 14-year-old man has been arrested in connection with a shooting at a Texas store that left three dead and one injured.

Garland police chief Jeff Bryan said the suspect was arrested Monday afternoon but has not yet been charged with murder.

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A 14-year-old man in a Sunday night incident that killed three teenagers and injured another in a Texas store has been arrested with a warrant for his arrest, authorities said.

"For the past 30 minutes, we have arrested a man. Someone we suspect of shooting. He is a 14-year-old man," Garland police chief Jeff Bryan said Monday afternoon during a press conference.

Bryan later made it clear that the suspect had not yet been charged with murder, but was arrested with a warrant for his death.

Identity and the victims were not released. Bryan said the victims were between 14 and 16 years old. A 15-year-old shopkeeper was injured, Bryan said.

All the victims were Latin boys, Bryan said. Police know two of the young men entered the store together. But the 14-year-old victim "was there ordering food for her family," Bryan said.

The suspect fired 40 shots and more magazines. The suspect fired at least 20 rounds, Bryan said.

"We want to know why. We have no answer as to why. We are trying to understand this," Bryan said. "If it's kids, if it's 14- and 16-year-olds doing the acts, and the victims of the acts, it's even harder for us to understand that."

During a news conference, Bryan said police were searching for a male "interested person".

Police responded to the scene in Garland, northeast of Dallas, just after 7:30 p.m., according to the city police department.

They found four men inside the shop shot. Three people were pronounced dead at the scene, and a fourth victim was taken to hospital, Garland police said in a statement.

A surveillance video found in the store shows all four people shot inside the store. The video then showed "a man with light skin came out of a white Dodge 4 door truck, opened the front doors of a grocery store, and then started firing a shotgun, hitting the victims," ​​according to the statement.

He was seen returning to a white truck on the side of the passengers before the truck left, fleeing the scene "at high speed," police said.

A fourth man was taken to hospital in critical condition, and the gunman was still at large, police said.

A fourth man was taken to hospital in critical condition, and the gunman was still at large, police said. via NBC5 DFW

The suspect was last seen wearing a baseball cap, blue face mask and black running shorts. He was not wearing a shirt according to police.

"The investigation is still ongoing and investigators are still trying to determine the cause of the shooting," police said, urging anyone with information to call the Garland Police Department on 972-485-4840. Tipsters can also report anonymously by calling the Garland Crime Stoppers at 972-272-8477 (TIPS).

Up to $ 5,000 is awarded for any information leading to the notification and arrest of a suspect.