Pakistan, long at odds with the United States over the war in Afghanistan, has begun to play a behind-the-scenes but central role in supporting U.S. peace talks with the Afghan Taliban, including by facilitating travel to negotiations, U.S. officials and Taliban sources say.

The Pakistani assistance, which has not been reported in such detail before, also includes exerting pressure on Taliban leaders who fail to cooperate, including by detaining members of the militants' families, the insurgents say.

Pakistan's role in the peace negotiations is a delicate one, with Islamabad seeking to avoid demonstrating the kind of broad influence over the Taliban that Washington has long accused it of having. Sources caution its help could be temporary.