Possible break in Border Patrol Agent's death?

VAN HORN -- According to search warrants obtained by CBS 7 , FBI agents obtained a search warrant for a vehicle that might have been involved in a possible attack that left one Border Patrol Agent dead and another injured.

In the court documents, the agent says "a source" provided information about two brothers who were involved in the attack.

The source says they were a part of a group of illegal immigrants.

A second source also identified them as the people who attacked the Agents with rocks.

They have denied their involvement, but admitted to driving the car.

Investigators are combing through the car.

CBS 7 News will continue to bring you the latest in this developing story.