The U.S Assistant Secretary of State Richard Boucher arrived in Islamabad on Saturday amid increasing cross-border missile attacks in Pakistan, local media reported.
Boucher is paying an unannounced visit to Pakistan and will meet Pakistani officials during his stay in Islamabad, News Network International (NNI) news agency said.
Boucher's visit came at a time when the U.S.-led coalition forces have stepped up missiles raids in Pakistan's tribal regions, which sparked anger and complaint from the Pakistani side, reported Xinhua.
A suspected U.S. pilotless drone on Thursday fired missiles in South Waziristan tribal agency, killing six and injuring five.