Rights groups worried about violent crackdown in Egypt

Egypt's military government has warned supporters of overthrown president Mohammed Morsi to end their sit-ins for everyone's safety. Increasing support for the police is fuelling concerns about the possibility of a violent crackdown. Rights groups are worried that more violence is inevitable. Amnesty International says dispersing the crowds of protesters by force would be a recipe for disaster. Al Jazeera's Sherine Tadros reports from Cairo.