The US says it has launched an air strike against militants from the Islamic State (IS) group in Iraq. The Pentagon said American aircraft attacked artillery that was being used against Kurdish forces defending the northern city of Irbil. President Barack Obama authorised air strikes on Thursday, but said he would not send US troops back to Iraq. The Sunni Muslim group IS, formerly known as Isis, now has control of large swathes of Iraq and Syria. In June, IS took control of the city of Mosul. Earlier this week, its fighters seized Qaraqosh, Iraq’s biggest Christian town, and other towns nearby. ‘Carefully and responsibly’ According to the Pentagon statement, two F/A-18 aircraft dropped 500-pound laser-guided bombs on mobile artillery near Irbil. — BBC online