CAIRO — Mohamed ElBaradei, the Nobel laureate who has become a leading opponent of President Hosni Mubarak of Egypt, returned to Cairo on Thursday in an attempt to galvanize youth-led street protests that extended into a third day across the country.
Smoke rose over the city of Suez on Thursday as sometimes violent clashes continued there. In the capital, a relative calm settled over the streets in anticipation of a new wave of demonstrations anticipated for Friday.
Raising the stakes, the Muslim Brotherhood, long the country’s largest organized opposition group, intends to end days of official inaction to enter fully into protests on Friday. On its Web site, the group said it would join “with all the national Egyptian forces, the Egyptian people, so that this coming Friday will be the general day of rage for the Egyptian nation.”
Mr. ElBaradei, the former head of the International Atomic Energy Agency who has sought to refashion himself as pro-democracy campaigner in his homeland, is viewed by some supporters as capable of uniting the country’s fractious opposition and offering an alternative to Mr. Mubarak’s authoritarian rule. Critics view him as an opportunist who has spent too little time in the country to take control of a movement which began without his leadership.