Police say three teenagers were killed and a fourth was critically wounded when another teen opened fire inside a Dallas-area gas station.

Iran Press/America: Three teenagers were killed and a fourth was critically wounded when another teen shot them at a gas station in the Dallas area over the holiday weekend, police said Monday.

According to US media, the shooting happened Sunday night in the Dallas suburb of Garland and was captured on surveillance video, the Garland Police Department said. Investigators are still trying to determine a motive.

Garland Police Chief Jeff Bryan said a 14-year-old boy who investigators believe is the shooter was arrested Monday afternoon.

In a surveillance video police showed during a news conference, a shirtless boy or man could be seen crouching while walking toward the store and carrying a handgun. He swings open the door and starts shooting into the store from the doorway.

Police said he fired more than 20 rounds from a .40-caliber pistol.

Every year thousands of people lose their lives or get wounded by gunshot attacks. Based on official statistics there are around 270 to 300 million guns in the US, which is almost one gun for every American. 219

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