A federal review cites poor judgment by a security guard who found a bag outside a government building in Detroit last year and stashed it under a desk where it remained for weeks — with neither the guard nor anyone else in the building aware that it contained a bomb.

The report by the Homeland Security Department’s office of inspector general released on Wednesday also said the guard’s employer, a contractor, and the federal agency that oversees security at the Patrick V. McNamara Federal Building shared some responsibility as well for the bomb going undetected.

“Although the IED (improvised explosive device) did not explode, it represented a risk to the safety and security of the building and its occupants,” the report said.

READ MORE: CNN