Updated at 3:15 p.m. Tuesday with more details from police.

Authorities are offering a reward for help arresting four men believed to be responsible for killing a 14-year-old girl and injuring a 16-year-old boy in Pleasant Grove on Monday night.

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Police believe the shooting took place in the 1800 block of Ormond Drive. Witnesses told police that four males in a dark-colored vehicle drove up to another vehicle and fired multiple shots.

The victims drove to a convenience store to get help.

Cliff Giddings, who was working at the convenience store the night of the shooting, told our partners at KXAS-TV (NBC 5) that 14-year-old Natalie Hernandez went into the store and fell to the floor, saying, "I've been shot."

She told Giddings she had been shot in the stomach, Gidding said.

A 16-year-old boy was also injured.

Officers found them about 9:45 p.m. near Umphress Road and South Buckner Boulevard.

Natalie died at Baylor University Medical Center. The boy was in stable condition on Tuesday. Two other people were present but were not harmed, police said.

Crime Stoppers is offering as much as $5,000 for help arresting and indicting the suspect or suspects. Tips to Crime Stoppers can be submitted at 214-373-8477.

Anyone with information about the shooting can also call Dallas police at 214-283-4801 or email e.montenegro@dpd.ci.dallas.tx.us.