Pentagon officials confirmed Thursday that a second U.S. military team was in the same area as the 12-soldier team ambushed in Niger earlier this month.

“There are other teams that operate in Niger. There was one that had something to do with this operation, but I’m not going to be able to give you any more specific details about what happened until we get [through] the process of investigation,” Joint Staff Director Lt. Gen. Kenneth McKenzie told reporters at the Pentagon.

“It’s involved in the timeline and we just want to make sure that we have the opportunity to get it right and understand the totality of it before we bring it forward,” he added.

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Numerous questions remain after the Oct. 4 attack that resulted in the deaths of four Army Green Berets and the injury of two others near the village of Tongo Tongo. The group of U.S. soldiers and 30 Nigerien troops were ambushed coming back from a reconnaissance mission in the village.

The Defense Department and the FBI have launched investigations to determine what went wrong and why the four soldiers wound up dead.

Earlier in the day, Robert Karem, assistant defense secretary for international security affairs, and the Joint Staff’s Maj. Gen. Albert Elton briefed lawmakers on Capitol Hill in a closed meeting.

McKenzie would not say more about the second team, but Reuters reported the team was tasked with grabbing a militant in the area.

McKenzie told reporters earlier this month that U.S. and Nigerien forces had “done 29 patrols without contact over the previous six months or so,” with no indication that such an ambush would occur.

He corrected the number on Thursday, saying it was closer to 26 patrols.

When asked, he also addressed the potential cause of the hour delay between when the ambush began and the soldiers called for help. McKenzie said the fighting could have been too intense for the soldiers to use their communications equipment, or they could have first thought the attack wasn’t significant enough to call for help.