Texas authorities on Friday were searching for a gunman who shot and killed two men on a Houston freeway on Thursday before being chased off by a witness who opened fire at him.
Authorities on Friday described the gunman as a Hispanic male in his 20's armed with what they believe was gun similar to an AR-15 assault-style weapon.
Police could not confirm whether the victims were targeted or whether the incident was a case of road rage.
Houston Police Chief Bobby Dobbins said the killings could also have been drug-related, as narcotics were found in the targeted car.
"As crazy as things are right now in our society, was this a road rage incident and these guys just happened to have narcotics in the car?" Dobbins told reporters.
The incident unfolded just before 6 p.m. when a car driven by the suspect rammed another vehicle on Interstate 10 in Houston. The suspect then stepped out of his car, described by police on Friday as a "newer model, dark colored four-door sedan," and began shooting at the front of the struck vehicle, Dobbins said.
There were two people inside the targeted car.
An unidentified male witness pulled out a pistol and started firing shots at the suspect, Dobbins said. The suspect then fled in his vehicle, along with a male passenger.
Other witnesses tried performing CPR on the two victims, aged 25 and 33, before authorities arrived, but to no avail.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)