TEXAS – Was Border Patrol Agent Rogelio Martinez really stoned to death? Is his partner hospitalized after receiving blunt force trauma from rocks? Those are the questions we’re waiting to have answered.

Illegal immigrants appeared to have “ambushed” two U.S. Border Patrol agents near the Texas border with Mexico and bashed their heads with blunt objects—possibly rocks—killing Martinez, 36, and sending another unnamed agent to a hospital in serious condition Sunday, a National Border Patrol Council (NBPC) official told Fox News.

Martinez was killed and his partner injured while they were patrolling the Big Bend Sector, leading authorities to scour West Texas for the attackers, officials said. The agents responded to a “border crossing monitor” that indicated activity in the area. The location of the activity monitor was on Interstate 10 near the Van Horn Station in the Big Bend Sector, El Paso, Texas. Agents in the area were tracking a group of illegal aliens crossing into the United States. Martinez was dispatched to the activity alarm sensor. The second agent responded as a back up officer.

The back up officer was able to notify dispatch that both officers were injured and needed assistance.

Additional agents arrived and provided emergency medical care for each one. They were transported to a nearby hospital where Martinez succumbed to his injuries. The second unnamed agent remains in serious condition.

If the attackers fled to Mexico, it will further compound the homicide investigation.

Although few details about the incident have been released, Brandon Judd, the president of the NBPC, told Fox News on Monday it appeared Martinez and the second agent were “ambushed” by a group of illegal immigrants.

“We don’t know exactly what happened because we weren’t there. However, just from agents that were working in the area, reports are saying it was an attack and it would appear to be an ambush,” Judd said.

He added: “There’s a high likelihood this was an assault on the agents.”

“We strongly believe rocks were what was used,” NBPC Vice President Art Del Cueto told KTSM.

Official previously verified there were no firearms used in the assault on the agents.

(Photo: @USBPChief Twitter)