Analysts in the state-run news media said early returns indicated that Salafi groups could take as much as a quarter of the vote, giving the two groups of Islamists combined control of nearly 65 percent of the parliamentary seats.

That victory came at the expense of the liberal parties and youth activists who set off the revolution, affirming their fears that they would be unable to compete with Islamists who emerged from the Mubarak years organized and with an established following.