Quote:Multiple suspicious packages containing explosive material were sent to at least three military installations in the Washington, D.C. area, a senior defense official told Fox News Monday.

Officials told Fox 5 DC a suspicious package was received at the National Defense University on Fort McNair in Southwest Washington D.C. at around 8:30 a.m. The building was evacuated and an Army Explosive Ordnance Disposal team from Fort Belvoir, Va. examined the package, which tested positive for black powder and residue.

An X-ray of the package indicated a suspected GPS and an expedient fuse were attached, Army officials said. The package later was rendered safe.

At approximately 11 a.m., Naval Support Facility Dahlgren in King George County, Va. also received a suspicious package that was found to be safe, officials said.

Later in the day, officials at Fort Belvoir said they had also received a suspicious package, but it was rendered safe.

"The FBI responded to multiple government facilities today for the reports of suspicious packages. Each package was collected for further analysis by the FBI," said Nicole Schwab, a spokesperson for the FBI Washington Field Office.

Quote:Hours after news that suspicious packages were turning up in and around Washington, D.C., an arrest was made on the other side of the country. Thanh Cong Phan, 43, appeared in court in Washington state a little more than 24 hours after 11 packages he allegedly mailed arrived at military bases in the D.C. area.

Phan had a history of writing crank letters to the military, and rambling notes included in the packages immediately fingered him as a suspect. He was arrested at his home in Everett, Washington, on Monday night, much to the surprise of a neighbor.

"I'm in shock, I don't know what to say, its so close to my house," the neighbor said.

Phan has been charged with one count of shipping explosive materials, which carries a maximum penalty of 10 years in prison.

The packages contained what the FBI called "potential destructive devices" and were sent to government mail-processing facilities at the CIA, the Naval Surface Warfare Center, Fort Belvoir, Joint Base Anacostia-Bolling and Fort McNair.

Quote:The motive for mailing the packages is unclear and the FBI warns that additional packages may show up at other mail processing facilities in the D.C. area.