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 one agent and sending another to a hospital in serious condition... Rogelio Martinez, 36, was killed and another agent, was injured while patrolling the Big Bend Sector, leading authorities to scour West Texas for the attackers, officials said.... it appeared Martinez and the second agent were “ambushed” by a group of illegal immigrants....“There’s a high likelihood this was an assault on the agents.”... Martinez and his partner suffered traumatic injuries to...