Here’s our warm, fuzzy news of the day: Bomb parts smuggled into 10 federal buildings during test.

WASHINGTON (CNN) — Plainclothes investigators sent to test security at federal buildings in four U.S. cities were successful in smuggling bomb components through guard posts at all 10 of the sites they visited, according to a government report.

The investigators then assembled the bombs in restrooms and freely entered numerous government offices while carrying the devices in briefcases, the report said.

The buildings contained offices of several federal lawmakers as well as agencies within the departments of State, Justice and Homeland Security, which is responsible for safeguarding federal office buildings.