Fifteen people were killed after Egyptian security forces attacked pro-Morsi supporters who were protesting, an eyewitness said on Wednesday morning.Egyptian security forces fired tear gas at a sit-in protest by supporters of deposed President Mohamed Morsi, a Reuters witness said.The state news agency said security forces had started clearing out two protest camps by Morsi supporters in Cairo. A military helicopter hovered overhead as thick clouds of tear gas filled the air near the main sit-in at Rabaa al-Adawiya in northeast Cairo.
