Members of the military and police stand outside Fort Hood on November 5, 2009 in Killeen, Texas. At least one gunman killed 12 people and injured 31 in a shooting on a military base at Fort Hood this afternoon. One shooter was killed by military police and at least two other soldiers are in custody. (Photo by Ben Sklar/Getty Images)
First Lt. Joy Crabaugh, Quantico's media officer, said the base is monitoring the situation at Fort Hood and "pertinent" lines of communication were in place.
The base is implementing appropriate measures to ensure the safety of the base and its Marine and civilian residents and employees, Crabaugh said.