CAIRO — Egyptian President Hosni Mubarak resigned Friday and the military took control of the country after weeks of widespread protests and economic turmoil that have shaken this besieged nation and raised calls for democracy across an increasingly restive Middle East.

“”President Hosni Mubarak has decided to step down and has handed power to the Supreme Council of the Egyptian Armed Forces,”” Vice President Omar Suleiman announced on state radio and television.

Those comments marked a stunning end to a dominating rule that spanned 30 years and saw Mubarak rise as a strategic U.S. ally in a troubled region.

Mubarak spent his presidency crushing opposition voices. But it was years of pent-up anger exploding in a protest movement that overwhelmed his police state for 18 days and forced the military to nudge him aside.

Hundreds of thousands of demonstrators broke into chants and song as Cairo swelled with jubilation and wonder. Many of those in the square were born under Mubarak’s reign and what unfolded was a moment of transforming history in which a popular revolt toppled an enduring icon of Arab power.

The announcement was made hours after Mubarak and his family flew from Cairo to their home in the Red Sea resort of Sharm El Sheikh.

Demonstrators had coalesced Friday around the state television and radio building in downtown Cairo, while a few hundred protesters standing outside of the presidential palace in the Cairo suburb of Heliopolis had entered into a tense standoff with Mubarak supporters.

The protesters had erupted in anger after the president clung to power in a state address late Thursday night. It was not clear how a solution would be found to end the confrontation between the demonstrators and the ruling elite from Mubarak’s National Democratic Party. The military, which has served as the pillar of the modern Egyptian state, now finds itself caught in the middle of the surging antigovernment movement and Mubarak and his loyalists. Until now, Mubarak and his inner circle, who hail from the military’s ranks, have commanded their loyalty.

Mubarak had delegated most of his authorities on Thursday to his new vice president, Omar Suleiman, his loyal aide and former intelligence chief, and promised free and fair elections in September, constitutional reforms and an eventual end to emergency law. But for the swelling crowds in central Cairo’sTahrir Square, it was too little, too late after rumors had coursed through the city that the Egyptian president was leaving office.