(CNN) -- The FBI interviewed two passengers after a reported threat to a plane that landed in Las Vegas, Nevada, but neither of them have been charged.
FBI Special Agent Joseph Dickey said Sunday night that a man and a woman had been interviewed but were not in custody.
"No one has been charged with any crime in relation to this incident," he said.
The FBI's investigation surrounds an alleged incident aboard a US Airways flight that landed at McCarran International Airport in Las Vegas on Saturday night, police in Las Vegas said.
Jonella Culmer, a spokeswoman for the Transportation Security Administration, said the agency became aware of a mechanical issue on US Airways Flight 399 from Las Vegas to Phoenix about 8:15 p.m. ET.
"The flight landed safely and during taxi, a passenger allegedly made an inappropriate comment," Culmer said.
The incident did not appear to be terrorist related, Dickey said.
"Due to maintenance and out of an abundance of caution, the flight returned to Las Vegas," said Michelle Mohr, a US Airways spokeswoman.
Mohr said "there was an incident that required authorities," but would not elaborate, saying it was a police matter.