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The cellphone of one of the terrorists involved in the firefight at the U.S. Embassy and NATO’s headquarters in Kabul on Sept. 13 revealed that the attackers had been in constant touch with their handlers in Pakistan during the course of the 20-hour operation, the officials said.

“We can confirm that such spectacular attacks can only be launched with the help of ISI,” the Afghan official said in an interview from Kabul.

Pakistan’s military and intelligence agencies view the Haqqani Network as a proxy that safeguards Pakistani interests in Afghanistan and limits India’s influence. Pakistan and India, nuclear-armed South Asian rivals, have fought three wars since independence in 1947.