Egyptians are voting for the second day in the country's historic presidential election, 15 months after the ousting of Hosni Mubarak.
Queues have formed at some polling stations, with government workers taking advantage of a public holiday to cast their votes.
The vote began on Wednesday , amid huge excitement and some anger over one of the leading candidates in the race.
Ahmed Shafiq, the former prime minister under Mubarak, was pelted with stones and shoes as he voted in Cairo. "The coward is here," one man shouted as the 70-year-old was forced to retreat to his car.
Shafiq, a former Air Force commander, is expected to win significant support in the election, although his ties to the old regime make him a deeply divisive figure.
On Twitter, some young Egyptians who joined the revolution bemoaned their parents' support for the controversial candidate.
"My dad is actually trying to convince me with Shafiq," one tweeter complained.
In a clear break with the past, when Hosni Mubarak voted in guarded seclusion in his rigged elections, the candidates were seen waiting in queues with their fellow voters.
Among them was Amr Moussa, the 75-year-old former head of the Arab League, and one time foreign minister under Mubarak. He is attracting support from those who favour a secular president in a contest which pits secularists against Islamists.
The Muslim Brotherhood's candidate Mohammed Mursi said voters would not accept anyone from "Mubarak's corrupt regime".
Many Egyptians hope that the election will be a turning point after more than a year of political turmoil and sporadic violence since the revolution.
The results are expected to trickle out after polls close tonight, but an official announcement on the outcome won't come until next week.
If, as expected, no candidate wins more than 50% of the vote, there will be a run-off election between the two leading contenders in mid June.
The military council which has ruled Egypt - much to the anger of many Egyptians - since Hosni Mubarak's resignation has pledged to hand over power to a civilian leader by the end of June.
But more unrest could lie ahead, with a new constitution defining the role of the president, the military and the parliament - now dominated by the Muslim Brotherhood - yet to be written.