updated 2/4/2009 5:21:12 AM ET 2009-02-04T10:21:12

A Colorado man accused of threatening to kill President Barack Obama and blow up a suburban Minneapolis mall has pleaded not guilty.

Timothy Gutierrez, 20, of Cortez appeared in federal court in Durango on Tuesday for arraignment and a detention hearing. He was ordered detained without bond.

Gutierrez is charged with sending threatening e-mails to the FBI in Washington, D.C.

Prosecutors say the first e-mail threatened Obama, and the second said explosives would be used to damage or destroy property at the Mall of America.

Gutierrez has said the threats were a prank. He turned himself in Jan. 29 at the FBI's office in Durango.

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