Key questions

Story highlights Two months later, investigators are still trying to remedy some crucial questions

(CNN) The Pentagon’s investigation into the October ambush of a Green Beret-led staff in Niger, which killed four US soldiers, is focusing on different areas where problems may have occurred before and after the attack, CNN has learned.

The team was traveling with 30 Nigerien soldiers if they were attacked by approximately 50 ISIS-affiliated fighters armed with rocket propelled grenades, mortars and heavy machine guns, according to US armed service officials.

Through the subsequent gun challenge, which lasted all night, four All of us soldiers — Staff Sgt. Bryan C. Black, Personnel Sgt. Jeremiah W. Johnson, Personnel Sgt. Dustin M. Wright and Sgt. La David T. Johnson — were killed and two were wounded.

Five Nigeriens were also killed. US-Nigerien forces managed to destroy 20 militants through the firefight, a defense recognized previously told CNN.

The body of Sgt. La David Johnson was recovered 48 hours after the attack. Extra remains of Johnson’s were recovered on November 12 by a US armed service and FBI staff that traveled to the region.

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