A suspected US drone attack on Thursday killed four alleged militants in North Waziristan, report said. The spy plane fired two missiles on a vehicle, killing four alleged militants in Tehsil Mirali of the tribal region bordering Afghanistan. Identification of those killed was not known. The Thursdays drone attack came on the day the Foreign Office of Pakistan said there was no justification nor understanding for US drone strikes. "We believe that they are counter-productive and also a violation of our sovereignty," foreign ministry spokesman Abdul Basit told reporters. "We hope that the U.S. will revisit its policy," he said, adding that the scaled up drone war was not serving the larger strategic interests, especially in the context of our efforts to win hearts and minds, which is part and parcel of our strategy against militants and terrorists."