At least 15 people have been killed in a shooting incident in Cairo, amid continuing unrest over the removal of Egyptian President Mohammed Morsi. The Muslim Brotherhood said the army opened fire on a sit-in by supporters outside the Presidential Guard barracks where Mr Morsi is thought to be held. The health ministry says an army officer was among those killed. Mr Morsi, Egypt’s first Islamist president, was ousted by the army on Wednesday after mass protests. He has been placed in detention and is believed to be held at the Presidential Guard Club, where his supporters have been staging a sit-in since last week demanding his reinstatement. The Muslim Brotherhood, the movement Mr Morsi comes from, said the army raided the sit-in at about 04:00 (02:00 GMT) as many of the protesters were performing dawn prayers. One protester, Mahmud al-Shilli, told the AFP news agency that the Republican Guard had fired tear gas but that a group of men in civilian clothing had then opened fired. “The thugs came from the side. We were the target,” he told AFP. In a statement read on state media, the army blamed to the shooting on “an armed terrorist group” which had tried to storm the barracks. The statement said some 200 people had been arrested and were found to have large amounts of weapons, ammunition and petrol bombs. Mr Morsi was replaced on Thursday by Adly Mansour – the head of the Supreme Constitutional Court – who promised to hold elections soon but gave no date. On Sunday, tens of thousands of both supporters and opponents of Mr Morsi rallied in many Egyptian cities. Source BBC