U.S. State Department spokesman Philip Crowley on Saturday urged Egyptian President Hosni Mubarak to take actions to reform as tens of thousands of Egyptians defied a curfew and remained on the streets of downtown Cairo on Saturday.

"With protesters still on the streets of Egypt, we remain concerned about the potential for violence and again urge restraint on all sides," Crowley said on his Twitter account.

"The people of Egypt no longer accept the status quo. They are looking to their government for a meaningful process to foster real reform," he said.

Crowley said the Egyptian government cannot "reshuffle the deck and then stand pat," urging Mubarak to take actions following his pledge to reform.

Mubarak on Saturday, in response to violent nationwide protests, fired his cabinet and appointed intelligence chief Omar Suleiman as Egypt's first vice president in 30 years. He also appointed Aviation Minister Ahmad Shafiq as the new prime minister.

But the protesters on Egyptian streets appeared unsatisfied with the moves, continuing to demand the ouster of Mubarak.