BF2S Forums Shooting at the Pentagon

Pentagon police in the vicinity of the South parking lot heard five to seven shots fired at about 4:55 a.m. (0855 GMT). They closed-off access to the Pentagon for 45 minutes, refusing to let people in or out, until they deemed the area safe.

Authorities later discovered that two of the Pentagon's protective exterior windows were shattered -- but not penetrated -- by two of the shots. The offices at the U.S. military's headquarters had been undergoing renovation and were unoccupied.

"We believe that there may have been other bullet strikes on the building," Calvery said, adding checks were underway.

Tuesday's shooting follows a similar incident overnight Sunday at the National Museum of the Marine Corps in Triangle, Virginia, near the entrance of Marine Corps Base Quantico.

Lin Ezell, the museum's director, told CNN Tuesday that investigators have determined that one or more assailants used rifles to fire 10 bullets at the building -- five hitting glass windows, the rest hitting metal panels. Authorities haven't pinned down exactly where the shots were fired from, though they believe they came from Interstate 95 or nearby.

No one was hurt in that incident, which occurred between 12:15 a.m. and 5 a.m. when the building was unoccupied, Ezell said. No one has claimed responsibility and there were no known threats prior to the shooting, she added. Military police and the Prince William County Police Department are investigating that incident.

Asked if there were any ties between that and the Pentagon shootings, a law enforcement official said that "except for the similarity in the incidents -- windows shot out at military facilities -- there is nothing to connect these incidents at this point."

Both shots appeared to have been fired from high-velocity rifles, the official said. But the FBI, which is helping with ballistics tests related to the Pentagon shooting, has yet to see evidence from the Marine Museum shooting.