Note: This story was last updated at 9:32 a.m. Aug. 15.

Many security cameras weren’t working when three anti-nuclear weapons activists sneaked into the Y-12 National Security Complex early in the morning on Saturday, July 28, a federal official said in a critical letter released Tuesday evening.

One of those cameras was near a fence penetrated by the protesters, who allegedly used bolt-cutters to slice through three fences before they walked to a high-security building known as the Highly Enriched Uranium Materials Facility, where bomb-grade uranium is stored.

The intruders, who allegedly spray-painted slogans and splashed human blood on the HEUMF, set off many alarms in a “multi-layered sensor system” in a fence line, but the Y-12 protective force failed to react, the official said.

When guards alerted by the alarms responded with a vehicle patrol, it took them too long to arrive at the scene, and once there, they “failed to take appropriate steps to take control of the situation,” said the official, National Nuclear Security Administration Contracting Officer Jill Y. Albaugh. She said a responding supervisor finally took control and removed the protesters.

Written Friday, Albaugh’s letter gives Babcock and Wilcox Technical Services Y-12, the plant’s managing and operating contractor, 30 days to show why the federal government should not proceed to terminate its contract.

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