HOUSTON -

A Houston man was ambushed and shot outside a southwest Houston gas station early Thursday morning.

Investigators said the crime happened around 1:15 a.m. at a gas station in the 12300 block of Bissonett near Cook.

Police said the victim, 21-year-old Johnathan Segura, was followed before the attack. Detectives said the killers were driving a red Dodge Magnum and a white Cadillac.

Houston police released surveillance photos of one wanted vehicle, a white Cadillac.

Police said they drove up to Segura's car, pulled out their guns and opened fire.

The shooters took off, and Segura crashed into a nearby utility pole. Detectives said he died at the scene.

So far, detectives said they've uncovered several pieces of evidence and are looking into Segura's background. Officials said a Texans logo was on the back of his car may lead officers to a motive.

"Often times in Houston, when you see the Astros symbol or the Texans symbol, it doesn't necessarily indicate that they're sports fans," said Sargent Brian Harris with the Houston Police Department. "It could indicate affiliations with other folks."

Police said some people from the surrounding bars heard the gunshots and tried to give Segura CPR, but left before police arrived.

If you know anything about this crime, you're asked to call Crime Stoppers at 713-222-TIPS (8477).