Young people traded mobile-phone pictures of ink-stained fingers that showed they voted. Others called relatives to boast of casting the first vote of their lives. In the well-off Cairo neighborhood of Maadi, a man hoisted his elderly, infirm father on his shoulder and carried him to a polling station.

"My vote today will make a difference. It's as simple as that," said first-time voter Hossam Bishay, 48.

The first test of Egypt's transition to democracy offered ominous hints of widening sectarian division, however.

Many were drawn to the polls in a massive, last-minute effort by the Muslim Brotherhood, the Islamist group that is Egypt's largest and most coherent political organization after the widely despised National Democratic Party of former President Hosni Mubarak, who was ousted last month in a national popular uprising.

Among other changes, the constitutional amendments would open elections to independent candidates, allowing parliamentary and presidential elections to replace the caretaker military government by early 2012.

AP