A suspected drone strike has killed four suspected militants . The U.S. military says it is investigating the incident and will take appropriate action if found to be a mistake. He attributes a lull in the first months of this year to tension between the United States and Pakistan over the arrest of CIA contractor Raymond Davis and other disputes between the countries ' intelligence services . Friday 's attack hit a part of Pakistan that is rife with Islamic extremism .
A suspected drone strike has killed four suspected militants . The U.S. military says it is investigating the incident and will take appropriate action if found to be a mistake. Friday 's attack hit a part of Pakistan that is rife with Islamic extremism .