Investigators are trying to determine what prompted the fatal shooting of a 17-year-old male outside a Houston-area gas station.

The Harris County Sheriff's Office says nobody has been arrested over the gunfire early Tuesday as two teenagers were near the business.

Authorities are seeking a vehicle that pulled up next to the teens and someone in the sedan opened fire before the car drove away.

Officials say the victim was dead at the scene. His friend summoned help.

The name of the dead teenager was not immediately released.