>> reporter: john, we're being told this occurred during a combine the u.s./afghan operation in afghanistan. during that operation encountered the enemy and two u.s. service members killed and several afghan soldiers also killed in this incident. we're told by the coalition there in afghanistan that the incident is under investigation and more details will be released. but this really just underscores how dangerous and how intense the fighting in afghanistan continues to be, despite the trump administration's efforts to conduct these peace talks with the taliban. these direct talks, u.s. officials described them as positive. they said they've made progress. nothing's been finalized yet and the talks themselves have actually opened up a rift between washington and cobbkabu. the of a phan government accusing the trump administration helping to sideline it during intense negotiations with the taliban. despite all the challenges,