An Afghan official says, a US drone strike has killed four Islamic State militants, including a senior commander. <br/><br/>The governor of the eastern Kunar province, said the strike yesterday killed Hazrat Gul and three other fighters in a mountainous area controlled by the militants. He said authorities learned of the deaths from intelligence reports. <br/><br/>Elsewhere in Afghanistan, a senior police official was killed by a bomb planted in his car in Kabul, according to a police spokesman.<br/>