The FBI has confirmed that a Delta Airlines flight 1500 from Detroit was grounded at Denver International Airport due to a "safety concern" on Friday. The FBI did not state the nature of the security concern.
A local ABC news station report said sources told CALL7 Investigator John Ferrugia that a flight attendant found a note in a rear galley of the aircraft indicating there was a bomb was onboard the flight.
Denver International Airport spokeswoman, Stacey Stegman said passengers were transported to another location by bus, and DIA Police are searching the plane. It remains unclear if the search turned up any evidence of explosives.
In February, the U.S. Department of Homeland Security issued a bulletin warning airlines about a new shoe-bomb threat, especially for inbound flights bound for the United States. U.S. government intelligence officials said information intercepted indicated that terrorist organizations are developing new bombs hidden in shoes.
In recent years, Homeland Security experts have increasingly warned that terrorist organizations including Al-Qaeda in the Arabian Peninsula (AQAP) are developing sophisticated bomb making techniques that are very difficult if nor impossible for TSA screeners or scanners to detect.