http://news.bbc.co.uk/2/hi/americas/4509516.stm
Investigations have begun after US air marshals on board an American Airlines flight shot and killed a man who started acting suspiciously.
US citizen Rigoberto Alpizar, 44, fled before take-off in Miami, saying he was carrying a bomb, officials said.
It was later confirmed that Alpizar had no explosives in his luggage. Witnesses suggested that the Costa Rican-born man may have suffered from mental illness.
The fatal shooting was the first since more marshals were deployed after 9/11.
James Bauer, head of the US air marshal service in Miami, said that controlled explosions carried out on Alpizar's luggage confirmed he was not carrying a bomb.
There was no indication of any link to terrorism, but federal air marshals were deployed in airports around the US as a precaution, Mr Bauer added.
'Unstable'
Alpizar had arrived in Miami, Florida, from Ecuador and was boarding a flight to Orlando at about 1410 local time (1910 GMT).
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I did hear the lady say her husband was bipolar and had not had his medication
Mary Gardner
Passenger
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Accounts from inside the plane suggest that Alpizar began behaving erratically before he was challenged by the marshals.
"He didn't look stable," fellow passenger John McAlhany told the Miami Herald.
As he ran down the aisle of the plane, a woman assumed to be his wife shouted for him to stop.
Witnesses interviewed after the shooting described how Alpizar's companion tried to tell fellow passengers or air marshals that he suffered from bipolar disorder, or manic depression.
Can we get rid of Air Marshals yet, or do you morons still think having people with guns on airplanes is a keen idea.
Man I bet Ossama is just laughing his *** off watching CNN in his hotel room in Pakistan thinking about how stunningly sucessfull he's been in terrifying the US.