(FOX NEWS) -- Murky details surround the apparent ambush attack that killed one U.S. Border Patrol agent and injured another, as initial reports the agents were shot were denied by the FBI, which had taken over the hunt for the killers.
Agent Rogelio Martinez, 36, was killed in the line of duty Sunday while patrolling the Big Bend Sector of Texas along the southern border with Mexico, and his partner, who was not identified, sustained serious injuries.
"They were not fired upon," said Jeanette Harper of the FBI's El Paso office. "There are so many different agencies working together that we need to come together and develop a timeline."
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