Egypt's Muslim Brotherhood's 'uprising' call as Morsi supporters killed Morsi supporters have vowed to fight on as the death toll from violent clashes rises across Egypt. AT least 40 people were killed today in clashes outside a military building in Cairo where supporters of the former president were holding a sit-in, an Egyptian health ministry official said. Ministry spokesman Khaled el-Khatib said initial reports also indicated at least 322 were wounded, although he gave no details on the circumstances of the killings. The Muslim Brotherhood immediately urged international intervention to prevent a "new Syria." Dispute over new PM latest snag for Egypt This led to around 35 dead and the figure is likely to rise," the Brotherhood said earlier in a statement. An armed Egyptian policeman scouts the surrounding buildings on top of a police van among protesters demonstrating with national flags against deposed President Mohammed Morsi in Cairo. The sit-in was outside the military facility where Morsi is being held. Egypt explained: What's going on A military spokesmen said gunmen opened fire on troops at the building, killing at least five supporters of Morsi and one officer. Mourad Ali, a Muslim Brotherhood spokesman, and a witness at the scene however said military forces opened fire at dawn on the protesters outside the Republican Guard building. The different accounts could not be reconciled. Satellite broadcaster Al-Jazeera showed footage from a nearby field hospital of at least six dead bodies laid out on the ground, some with severe wounds, AP reported. A medic from the area, Hesham Agami, said ambulances were unable to transport more than 200 wounded to hospitals because the military had blocked off the roads. Egypt's Muslim brotherhood has promised more protests, until president Morsi is re-installed as leader. Al-Shaimaa Younes, who was at the sit-in, said military troops and police forces opened fire on the protesters during early morning prayers. "They opened fire with live ammunition and lobbed tear gas," she said by telephone. There was panic and people started running. I saw people fall. Women and children had been among the protesters, she said.