A new era dawned in Egypt on Saturday as this nation of 80 million and hundreds of millions beyond its borders began to absorb the fact that an 18-day mass movement of largely nonviolent protest brought down a nearly 30-year military dictatorship and renewed the countrys lease on life. Within hours of the news that Hosni Mubarak had resigned as president, Egypts new army leadership quickly sought to project its control and assuage fears about military rule, at home and abroad. In an announcement broadcast on state television on Saturday, an army spokesman said that Egypt would continue to abide by all of its international and regional treaties which include its peace treaty with Israel and that the current civilian leadership would manage the countrys affairs until the formation of a new government, without giving a timetable. The Associated Press, quoting an official at the Cairo airport, said that some current members of the government had been barred from traveling abroad. The army spokesman urged citizens to cooperate with the police, after weeks of civil strife, and urged a force stained by accusations of abuse and torture to be mindful of the departments new slogan: The police in the service of the people.