False Alarm Triggers Hazardous Materials Response at Pentagon
It appears that a sensor in the air quality monitoring system was malfunctioning, detecting the presence of anthrax.
There was a bit of excitement at the Pentagon today.
Portions of the Pentagon were placed on lockdown Thursday morning after building systems detected an “air quality issue,” prompting a response that local emergency officials are describing as a “hazardous materials incident.”
“ACFD [Arlington County Fire Department] units, including our Hazardous Materials Team, are currently operating at the Pentagon in support of PFPA’s Hazmat Team during a hazardous materials incident,” it said.
Building systems detected an “air quality issue,” which prompted a shelter-in-place order, Pentagon spokesman Sean Parnell said in a statement.
“The Pentagon has sophisticated systems to ensure the safety of the building and its occupants,” Parnell said. “Those systems have detected an air quality issue necessitating precautionary measures until we determine its significance.”
“The Department is executing standard protection protocols, including a shelter-in-place order for the affected area. Response teams are in place and ready to support building occupants,” he added.
Pentagon on lockdown, HAZMAT crews rush in over 'hazardous materials incident' https://t.co/ClyClyBoih pic.twitter.com/iYWxGxiLZj
— New York Post (@nypost) June 11, 2026
Fortunately, it turned out to be a false alarm and the response was strictly precautionary in nature.
The Pentagon lockdown and evacuation was due to a false alarm, two sources familiar told CNN.
…A message sent by the Pentagon’s security team said an “air quality issue” had been detected and additional testing is needed.
“This additional testing could take one to two hours. Response teams are in place and ready to support building occupants if necessary. You may observe response personnel from multiple agencies and precautionary measures taking place in the center courtyard. Please do not interpret these activities,” the message said.
Floors two through five in corridors four through seven of the sprawling Pentagon complex were locked down, two of the sources said. The third source told CNN that police in the building wore gas masks and full chemical protective gear.
It appears that a sensor in the air quality monitoring system was malfunctioning, detecting the presence of anthrax. Anthrax, which can be used as a bioterror weapon, is a serious bacterial infection caused by Bacillus anthracis, usually contracted from infected animals or contaminated animal products.
The evacuation was triggered when a Pentagon sensor system detected the possible presence of anthrax, according to first responder radio traffic and a source familiar with the incident.
But the sensor system was malfunctioning, one source said, causing the false alarm.
— Zachary Cohen (@ZcohenCNN) June 11, 2026
It is good to see evacuation plans are in place and that staff knows how to respond. Hopefully, there will never be a need to evacuate this facility for a real hazardous materials incident.
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A good test of procedures and practice. Much better than scheduled ones,
The more things stay the same…
When I was working as a contractor in the Pentagon in the early ’70s, Halon had just come out (demo’d at SJCC ’73). The Air Force rushed to embrace this miracle fire suppressant that extinguished combustion without robbing personnel of oxygen. (It had other toxicities that weren’t discovered until much later). They surrounded the “disk farm room” in their cavernous computer facility (the size of three full football fields) with massive wall-mounted Halon tanks hanging from girder grids, enhancing the collective feeling of security of their entire chain of command.
They hooked them up to the original fire alarm system, in which any ONE sensor triggering would set off the alarm. Great for getting people out of a facility in situations where false alarms are tolerable — not so great for automated deployment.
One night, one sensor falsed. Every pressurized Halon tank in the disk farm discharged simultaneously. The reaction blew the tanks right off the walls, girders and all. The flying tanks scalped over half the disk drives in the room (which in those days were about 300MB of removable platters each, inside a cabinet about 120% the size of a washing machine). Total carnage, which our company (the manufacturer) enjoyed windfall revenues that year from entirely replacing.
DEC, Honeywell, Burroughs, or maybe IBM or perhaps all of the above like at the NSA. Yeah the removable disk washing machines drives were a riot. All kinds of interesting problems occurred with them. Many had to do with lid interlock failures or drive imbalances. Heh.
Ever watch one of those things walk across the room?
Never saw that but that is a common story told about those drives
was booker doing another fillabuster?
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