(ASSOCIATED PRESS) A military judge blocked several key pieces of evidence Monday that prosecutors said would explain the mindset of the soldier accused in the 2009 shooting rampage at Fort Hood, including his belief that he had a “jihad duty” to carry out the attack.

Prosecutors had asked the judge to approve several witnesses and various evidence to support what they allege motivated Maj. Nidal Hasan to kill 13 people and wound more than 30 others at the Texas military base. But the judge, Col. Tara Osborn, blocked nearly all of it.

Osborn barred any reference Hasan Akbar, a Muslim soldier sentenced to death for attacking fellow soldiers in Kuwait during the 2003 Iraq invasion. Prosecutors wanted to prove Hasan’s attack was a “copycat,” but the judge said introducing such material would “only open the door to a mini-trial” of Akbar.

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