Agents using surveillance technology detected a person a few feet from the international border attempting to conceal himself in a vacant lot Wednesday morning in Douglas.
It's unclear why the agents were in the area.
Digital billboards are going up in Texas, New Mexico, Arizona and California, with the FBI requesting information from anyone driving through Van Horn from 10 p.m.to midnight on Nov. 18, said Emmerson Buie Jr., the FBI special agent in charge, on Friday.
"We're looking at it as a potential assault on a federal officer", Jeanette Harper, public affairs officer for the FBI's El Paso division, told Newsweek Thursday.
To suggest the death was an attack or ambush is "very premature", Carrillo, who was at the scene, told CNN.
Harris pointed out the injuries seemed too severe to be accidental and that both men wouldn't have been injured in the same way by a sideswipe. A growing theory is that a tractor-trailer sideswiped Martinez and his partner, who suffers from memory loss.
In an interview with Fox News, Brandon Judd, president of the National Border Patrol Council, said the agents appeared to have been "ambushed" by illegal immigrants who bashed the agents' heads with blunt objects - possibly rocks. Shortly after the death, President Donald Trump renewed his call for a border wall. They provided the injured agents with immediate medical care and transported them to a local Van Horn hospital.
Adding to the mystery surrounding Martinez's death, the border area where Martinez was found is a difficult region to cross because of its mountainous terrain and the presence of the Rio Grande. U.S. Customs and Border Protection said only that they "were responding to activity".
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