Major Nidal Malik Hasan’s military superiors repeatedly ignored or rebuffed his efforts to open criminal prosecutions of soldiers he claimed had confessed to “war crimes” during psychiatric counseling, according to investigative reports circulated among federal law enforcement officials…

Investigators believe Hasan’s frustration over the failure of the Army to pursue what he regarded as criminal acts by U.S. soldiers in Iraq and Afghanistan may have helped to trigger the shootings.

“The Army may not want to admit it, and you may not hear much about it, but it was very big for him,” said one of the federal investigators on the task force collecting evidence of the crime…

Captain Surman told investigators that Hasan had formally contacted military prosecutors to report patients he was evaluating, according to people briefed on the exchange. She said Hasan signed his e-mails with “Praise Be to Allah.”