Står litt om saken her;
http://www.chicagobreakingnews.com/2...vacuation.html
"The plane, an airbus A320, had arrived from LaGuardia Airport in New York at 10:30 a.m. and had already parked. Many of the customers had already deplaned when a warning light went off indicating something might be wrong in the cargo area, said Rahsaan Johnson, spokesman for United Airlines"