Many view Egyptian military calls for protests as start of crackdown on Muslim Brotherhood

(CBS News) The Obama administration is telling Congress it won't use the word "coup" to describe the overthrow of Egypt's government. More than $1.5 billion in military and economic aid is at stake. In Egypt, the fight over who will lead that country will play out in the streets Friday.

Egypt's army seeks popular support to fight violence

Reporting from Cairo's Tahrir Square, Clarissa Ward reported there's a sense of deja vu here in Cairo as this city braces itself, yet another day of massive protests. Egypt's defense minister Gen. Abdel-Fattah el-Sissi, who ousted President Mohammed Morsi just a few weeks ago, called on Egyptians to come out onto the streets and to give Egypt's security forces a "mandate" to confront "violence and terrorism."

This is being interpreted by many as the beginning of a major crackdown on the Muslim Brotherhood, which has been camped out, demanding Morsi's release and his reinstatement as the president. However, that seems less likely than ever to happen now. Egyptian authorities are now officially investigating Morsi on charges related to his escape from prison in 2011, ratcheting up tensions in Cairo on what promises to be a crucial day.

Watch Clarissa Ward's full report above.