The gunfight took place between authorities and suspected cartel gunmen at a seaside Mexican resort on Dec. 18 in Puerto Peñasco.
The resort shootout left at least five suspected cartel gunmen dead, including possibly a high level Sinaloa cartel chief, Mexican authorities told CNN.
Witnesses told CNN that gunfire, as well as grenade explosions, took place for hours and Mexican authorities used helicopters to attack cartel gunmen on the ground.
"ATF has accepted responsibility for the mistakes made in the Fast and Furious investigation and at the attorney general's direction we have taken appropriate and decisive action to ensure that these errors will not be repeated," ATF said in a statement. "And we acknowledge that, regrettably, firearms related to the Fast and Furious investigation will likely continue to be recovered at future crime scenes."
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