More shots at Marine museum in evolving sniper case

Several shots were fired at a Marine Corps museum near Washington overnight, police said on Friday, in the latest of a series of shootings at military buildings around the US capital. No one was injured.

The FBI already linked a previous October shooting at the museum in Virginia to two other area shootings, one at a Marine Corps recruiting station in a different Virginia suburb and the other at the Pentagon.

In the October 19 Pentagon shooting, investigators believe a high-velocity rifle was used to shatter two exterior windows. No one has been injured in any of the incidents.

The Pentagon has said it is tightening security for Sunday's Marine Corps marathon after the latest shooting.

Unlike the Washington, DC, sniper shootings of October 2002, in which a sniper shot and killed 10 people and terrified the Washington area, this gunman appears to be targeting military buildings, not people. All the incidents occurred overnight or during off-peak hours.

The Pentagon was a target of the September 11, 2001, attacks. In March, a gunman shot and wounded two security officers near a Pentagon entrance, and was killed in the process.