Yikes – thanks to Allie Alvis for sending: “Info from security guard at NMNH” Updates when/if we learn more.
UPDATE:
#DCsBravest on scene IRS building 1111 Constitution Ave NW. Hazmat assignment investigating overheated storage batteries used for backup purposes. No injuries reported. Building fully evacuated due to abundance of caution due to possible fumes associated with this issue. pic.twitter.com/mHdJGCFqpV
— DC Fire and EMS (@dcfireems) September 6, 2019