Researchers at Los Alamos National Laboratory in New Mexico accidentally blew up a building on December 16 with a Civil War-style cannon. According to an occurrence report [pdf], which was first reported by the Project on Government Oversight, the lab's Shock and Detonation Physics team was testing a large-bore powder gun when they heard a "loud unusual noise."
About 20 minutes later, the researchers ventured out of their bunker to see what had happened. Upon further investigation of the facility’s Technical Area 15, the team discovered that Building 562 had been blown apart. Two doors were "propelled off the structure" and concrete shielding blocks were blasted off the walls. Parts of the cannon were also found lying on the asphalt nearby. The Facility Operations Director declared a "management concern" regarding the explosion. No-one was hurt, but sources told POGO that damages could cost $3 million. The lab reported that it has conducted a "critique" of the incident.
This is not the first time that Los Alamos has fallen short when it comes to safety and security matters. In early 2009, it emerged that the nation's major nuclear weapons lab had misplaced at least 67 computers sensitive information, and others had been stolen from a lab employee. The facility has also come under fire in recent years for, among other things, failing to properly protect nuclear materials and shipping a deadly radioative package by Fedex.