Southwest airline jets vandalized

September 22, 2011 1:14:07 PM PDT
Federal agents want to know who is vandalizing Southwest Airline planes with what appears to be Arabic messages.

Arabic-type symbols have mysteriously appeared on several Southwest jets in recent weeks. The writings are painted on with chemicals that only show when the pilot turns on the plane's engine and the aircraft heats up. The FBI and TSA call the crime 'sophisticated".

Southwest is working with authorities to find out who's responsible. However, they say this is not a safety issue.