Reports from Mexico and the U.S. are conflicting about what happened in the shooting that killed Border Patrol agent Nicholas Ivie.
The FBI is investigating the possibility that Ivie was killed by friendly fire when he and a second agent were shot near Bisbee on Tuesday.
A spokesperson said they're trying to determine if Ivie and a second agent might have exchanged gunfire.
So far, U.S. officials have said no arrests have been made in this case.
However, Mexican authorities said they've detained two people who were seen heading back into Mexico after the shooting.
A Mexican newspaper called "Entre Todos" revealed the identity of two people arrested on Tuesday.
The two were found hiding in some bushes. They had packages of marijuana and were also carrying a 38 caliber handgun.
While the Mexican embassy in Washington confirmed the arrests, U.S. officials haven't said or confirmed anything.
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