Many shops and businesses have been closed as people rushed to buy all kinds of food in fear of commodity scarcity due to riots. Egypt's central bank announced Saturday that it will be closed on Sunday.

Demonstrators gather near the main Tahrir Square in Cairo, Egypt, Jan. 29, 2011. Tens of thousands of Egyptians defied a curfew and remained on the streets of downtown Cairo on Saturday, demanding the ouster of President Hosni Mubarak. [Cai Yang/Xinhua]

Violent clashes took place in cities like Ismailiya and Suez, where many protesters were killed and dozens of them were injured.

According to the Egyptian Health Ministry, the nationwide death toll has reached 51 by Saturday afternoon. The number may rise.

Several opposition parties have used the opportunity to urge President Mubarak to step down.

Mohamed ElBaradei, Egypt's top dissident and former chief of UN nuclear watchdog, said Saturday during an interview with Qatari-based Al Jazeera TV that the nomination of vice president and new prime minister was not enough, vowing to press the president till he steps down.

Osama el-Ghazali Harb, leader of the opposition Democratic Front Party, repeatedly called for the end of Mubarak's regime.

The world has been watching the situation in Egypt.

U.S. President Barack Obama on Saturday met his national security team to discuss the current Egyptian crisis, renewing his call for Egypt to embrace reform.