NEW : Egypt 's army seizes 35 rockets at a Cairo-Suez checkpoint , military says . Egypt 's top prosecutor announces an investigation of Mohamed Morsy . The Muslim Brotherhood calls for protests in the streets and on state TV to demand that President Hosni Mubarak step down immediately. State media : At least 7 people were killed and 261 injured in clashes in Cairo overnight .
NEW : Egypt 's army seizes 35 rockets at a Cairo-Suez checkpoint , military says . Egypt 's top prosecutor announces an investigation of Mohamed Morsy . Authorities are looking into his role in a jailbreak . State media : At least 7 people were killed and 261 injured in clashes in Cairo overnight .