The FBI said it's assisting authorities in Charlotte but doesn't anticipate bringing federal charges against either suspect, WCNC reported.
Officers with the CMPD's bomb squad later confirmed that the explosive device in question was a homemade pipe bomb. It is believed to be some kind of explosive, but was not in Dandan's possession at the airport, according to WSOC. WNCN reports that the FAA has suspended Dandan's access to the airport while the FAA and the FBI are investigating the case. Dandan was being held on $45,000 bond, while Fells' bond was $60,000.
In March 2015, Dandan was arrested and charged with assault on a female.
Detectives with the CMPD, however, obtained warrants for the arrest of both men on Friday, November 10. According to CMPD, Charlotte Douglas Airport said Dandan, who was an air traffic controller, only had access to the offsite air traffic control tower and could not access any restricted areas of the terminal or ramp.
Dandan's roommate has also been arrested for having bomb-making materials, the Charlotte Observer.
The FAA confirmed to NBC Charlotte that Dandan's access to the airport was terminated following his arrest Friday afternoon. Fells had made the bomb to use it against a neighbor he had a dispute with but then changed his mind, police said. He refers to his job as an Air Traffic Control Specialist.
Weapons of mass destruction are described by the Federal Bureau of Investigation as any device "designed or intend to cause death or serious bodily injury through the release, dissemination, or impact of toxic or poisonous chemicals, or their precursors".
Any weapon that is created to release radiation or radioactivity at a level risky to human life.