The Latest: Senior US commander says Taliban faces 'dilemma'

The top commander of U.S. forces in the Middle East says the killing of the Taliban's supreme leader presents a difficult dilemma for the militants in Afghanistan.

Earlier a senior Taliban commander told the AP that Mansour had been killed in the Noshki district, near the Afghanistan-Pakistan border.

U.S. Secretary of State John Kerry is praising the killing of Taliban leader Mullah Mohammed Akhtar Mansour in a drone strike.

"Mansour posed a continuing imminent threat to U.S. personnel in Afghanistan, Afghan civilians, Afghan security forces and members of Resolute Support," Kerry said.

Kerry called for a post-Mansour Taliban to engage in serious peace negotiations with the Kabul government, saying, "It is time for Afghans to stop fighting and to start building a real future together."

A senior commander with the Afghan Taliban says the militant group's leader Mullah Akhtar Mansour has been killed in a U.S. drone strike.