At least 28 people died and 61 others were injured in a large explosion in the Turkish capital of Ankara on Wednesday, which targeted a bus carrying military personnel, according to an official at the armed forces' General Staff.<br />The explosion occurred during rush hour in an area close to where military headquarters and parliament are located.<br />"According to preliminary assessments, five people died and 10 people were injured," Governor Mehmet Kiliclar told the state-run Anadolu Agency.<br />"It is believed that a bomb-laden car caused the explosion."<br />It was not clear who was behind the bombing Wednesday.<br />Kurdish rebels, the Islamic State group and a leftist extremist group have carried out attacks in the country recently.