News At Seven-Thirty highlights: Prince William and Princess Catherine were wed at Westminster Abbey; wedding fever has reached Hong Kong; more than 160 tornadoes tore through the South America over several days; Obama reshuffled his top national security aides; Moroccon officials confirmed a bomb that killed at least 16 people was a terrorist act; U.N. nuclear agency admitted that a target destroyed by Isralei in 2007 was a nuclear reactor; High Court rejected the application by a developer for injunction to bar Mei Foo residents; A magistrate put a man suffering from autism on 1-year probation for threatening chief executive; government put forward proposals to refrom the regulatory system of the tourism industry.