By James Griffiths, Barbara Starr and Angela Dewan,
Nicholson (click here) gave a vague response to a question by reporters on who exactly ordered or greenlighted the strike, saying only that he enjoyed a certain amount of "latitude" to make decisions in his chain of command.
Nicholson also confirmed the strike was carried out in coordination with Afghan officials, and said that the mission had conducted rigorous surveillance before, during and after the operation to prevent civilian deaths.
"Let me be clear -- we will not relent in our mission to fight alongside our Afghan comrades to destroy ISIS-K in 2017," he said, referring to ISIS' regional branch.
Afghan President Ashraf Ghani said he approved of the strike and that it was designed to support Afghan forces and US forces conducting clearance operations in the region.
But former president Hamid Karzai accused the US of using Afghanistan as "a testing ground for new and dangerous weapons."