Prosecutors asked a US judge to commit the suspect in the Tucson shooting rampage that wounded Representative Gabrielle Giffords to a federal facility where he can be evaluated by psychologists to determine whether he suffers from a mental defect that makes him incompetent to stand trial.
They cited a YouTube video, in which prosecutors believe a hooded Jared Lee Loughner burns an American flag, and a photo posted on MySpace of the type of gun used in the January 8 shooting to suggest that the 22-year-old has mental issues.
The video, entitled America: Your Last Memory In A Terrorist Country!, shows a person thought to be Loughner wearing garbage bags on the lower part of his body and features a heavy metal song that repeatedly contains the lyrics “Let the bodies hit the floor”.
In the MySpace photo, the gun is seen resting on top of a US history book and on top of a circular item depicting the White House and containing photos of US presidents around its edges.
The filing by prosecutors marks the first time both postings have been publicly revealed.
Thirteen people, including Ms Giffords, were wounded and six others were killed in the shooting at January 8 event where the Arizona congresswoman was meeting with constituents.
Loughner has pleaded not guilty to charges of trying to assassinate Ms Giffords and kill two of her aides. He will be arraigned tomorrow on new federal charges that included the murders of a federal judge and a congressional aide.
Prosecutors say they are seeking the psychological evaluation to avoid any delays in the criminal case against Loughner.