Thousands of Brotherhood supporters burst into cheers on Cairo's Tahrir Square, waving national flags and chanting "Allahu Akbar!" or God is Great, greeting a dramatic victory. Morsi will be sworn in on July 1, according to the election timetable.
Morsi, a 60-year-old, U.S.-educated engineer who spent time in jail under Mubarak, won the first round ballot in May with a little under a quarter of the vote. He has pledged to form an inclusive government to appeal to the many Egyptians, including a large Christian minority, who are anxious over religious rule.
-- Reported by NBC News and msnbc.com news services