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DENVER - A Federal source confirmed federal agents had investigated multiple threats made against the Arapahoe County Jail, airliners, airports, and a hotel.
Sheriff Grayson Robinson also confirmed that his office had received multiple threatening calls "months ago." He said his deputies did investigate.
The federal source confirmed that the telephone and email messages threatened to blow up those locations unless James Holmes was released.
Robinson added that the person who made the threats had threatened violence against other places, including Los Angeles.
He is being held in the Arapahoe County Jail pending trial for allegedly opening fire in a crowded movie theater on July 20. Twelve people were killed, 58 were wounded and 12 others were injured fleeing the theater.
The threats were tracked to computer addresses in Iran, the federal source said, but they may not have originated from that country.
**Editor's Note: An earlier version of this report said the Arapahoe County Sheriff had told 7NEWS he was unaware of the threats, but called back after realizing this was not a recent event.