Egypt's Interim President Urging for Calm Amid Violence

The Muslim Brotherhood's political wing is calling for an uprising

Egypt's interim leader has expressed sorrow over the deaths of at least 42 people near a barracks in Cairo, urging restraint amid ongoing unrest.

Adly Mansour also said he had ordered an investigation into the deaths.

The Muslim Brotherhood says its members were fired on as they staged a sit-in for ousted President Mohammad Morsi, while the army said "terrorists" tried to storm the barracks.

The Brotherhood's political wing meanwhile called for an "uprising".