"We have consistently raised our concerns at the highest level of government of Pakistan on the need to deny safe haven to extremists," said Elizabeth Trudeau, the State Department spokesperson.
Ms Trudeau also reminded Islamabad of the promise of Pakistan Army Chief Raheel Sahrif that it won't discriminate between terrorists.
"We have pressed the Government of Pakistan to follow up on their expressed commitment, their stated commitment, to not discriminate among terror groups regardless of their agenda or affiliation," she said.
"As we have in the past, we encourage the governments of Afghanistan and Pakistan to work together, not only in the wake of this attack, and to ensure that such attacks don't happen again, but to increase their cooperation countering violent extremism at large," Ms Trudeau said.
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