Two members of the Aryan Nation have been arrested in Nevada and accused of plotting a bacterial attack on the New York City subways, an FBI source said Thursday.

The source provided no other details. The Aryan Nation is a white separatist group.The FBI in Nevada said that two men were taken into custody in a luxury car outside a doctor's office in Henderson, Nev.

FBI spokesman Aurelio Flores in Las Vegas said only the matter was "serious." A news conference was set for Thursday afternoon Las Vegas time.