The U.S. ambassador to Afghanistan says there was "no question" that the Pakistani-based Haqqani Network was behind recent attacks in Afghanistan.
Coordinated assaults on Kabul and three other cities on April 15 left 36 insurgents, eight Afghan security personnel, and three civilians dead.
Although the Taliban has claimed responsibility for the attacks, Ryan Crocker laid the blame on the Haqqani Network.
The militant group based in northwest Pakistan is one of three Taliban-allied insurgent factions active in Afghanistan.
The United States has called on Pakistan to take action against the group -- with Islamabad insisting that it is already stretched fighting homegrown Taliban militants.
Named after its leader, Jalaluddin Haqqani
, the network is believed to number some 4,000 fighters.Based on reporting by Reuters and AP