"Unverified footage obtained from social media shows supporters of the ousted Egyptian president Mohamed Morsi being attacked by a gunman from a rooftop in Cairo. A man wearing a military helmet takes aim and firing from the roof into a crowd of pro-Morsi supporters. Another man appears to be filming. Victims of the shootings, covered in blood, are then rushed through the crowds and put onto vehicles. At least 50 people were killed and over 400 injured in clashes on Monday."