News At Seven-Thirty highlights: Osama bin Laden is dead; Washington and European capitals incrase security at their embassies over possible reprisal attacks; Osama bin Laden will go down in history as the most notorious terrorist ever; film smuggled out of Tripoli purportedly shows damage to Western embassies after they were attacked; discovery of a black box on Sunday may provide clues to the crash of an Air France flight 2 years ago; a 19-year-old girl was killed in a No.1 alarm fire in a residential building in Chai Wan; groups organised an event in a call for the release of Ai Weiwei; the sport of parkour is attracting a big fan base in Hong Kong.