A letter sent to the US embassy in Islamabad increased limitations on when and how diplomats can move outside the capital, the diplomatic source said, without giving further details.
Pakistan is seen as a key ally for the US in its fight against Islamist militancy, but relations have soured since the US gave Islamabad no warning of its raid into Pakistan in May that killed Al-Qaeda chief Osama bin Laden.
Both governments moved to prevent any public outbreak of disagreement after the restrictions were reported in Pakistani newspapers on Sunday.
"We are working with the Pakistani government to resolve the issue," US embassy spokesman Alberto Rodriguez said.
Pakistan`s foreign ministry said that "no US-specific restrictions have been applied" on diplomatic travel, but added it was "having a constructive engagement with the US Embassy in Islamabad in this regard".(*)
Editor: Jafar M Sidik
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