"Our expectation is that investigation will be thorough and complete and as transparent as possible. But in terms of its progress and where they are, you'd have to talk to Pakistani authorities on it," State Department Spokesman John Kirby said at his daily news conference.
"We're encouraged by the fact that the Pakistani Government condemned the attack and said that they would investigate," he said.
The spokesman said that the US would like the two countries to continue with their peace talks.
"He (Kerry) certainly encouraged India and Pakistan to work bilaterally to continue discussions and to try to work through these problems. I don't think they spoke with any great detail or specificity about the next round of talks and what's on the calendar. But writ large, yes, this was a topic of discussion with the Prime Minister," Kirby said.
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In their call on January 9, Kerry and Sharif talked a lot about this issue.
"...The State Department remains focused and committed to working bilaterally and multilaterally on counterterrorism challenges," Kirby said in response to a question.
Meanwhile, senior US officials believe that Pakistan is serious about investigation this time unlike in the past.
"We do not talk much in detail about the diplomatic conversations. He (Kerry) came away believing that the Pakistani government is serious about this particular incident, serious about investigating it, serious about trying to work with partners in the region, Afghanistan specifically," a senior State Department official said.
that the US should declassify and broadcast information indicating Pakistani support for the insurgency and its narcotics trafficking.
"Politically, Pakistan cannot be a member in good standing of the international community so long as its agencies or military services aggress against Afghanistan. Pakistan is currently designated by the US as a 'major non-NATO ally'. This status is wholly inappropriate. Pakistan's current policy and conduct would better merit its inclusion on the State Department's list of state-sponsors of terrorism," he said.
The former American envoy said the US can impose financial and travel restrictions on senior Pakistani officials known to be complicit in the insurgency, and freeze funds in US banks belonging to Pakistani entities, both military and corporate, involved in financing the Taliban.