 In Arlington County , a burst pipe flooded two corridors at the Pentagon . Employees , many of whom left the building when the earthquake was felt , were alerted to the flooding by an alarm system that was installed after the September 11 attacks . Arlington County 's Thomas Jefferson Theater — home to a middle school auditorium , a church , and several community theatre groups — closed for several months due to damage to its fly rack and proscenium . Nearby Alexandria also reported structural damages , though not any injuries . 
