Officials at Fort McNair evacuated a building after one of the packages was delivered, a spokesman said.
Among the locations where packages were recovered: the Central Intelligence Agency in Langley, Va.; Fort Belvoir, Va.; Fort Lesley J. McNair in Washington; Joint Base Anacostia-Bolling in Washington; and Naval Surface Warfare Center in Dahlgren, Va.
Authorities did not immediately name the man but said he was known to law enforcement.
During screening, the packages were found to be suspicious, although it is unclear what made them suspicious.
Morocco outline $20 billion World Cup bid
The system allows the referee or the video assistant to review decisions where a "clear and obvious" error is spotted. The FIFA Council meeting in Bogota, Colombia, on Friday selected Poland to host the U-20 football World Cup in 2019.
Another package was found Dahlgren Naval Air Station in Virginia. It was quickly rendered safe, the military said.
It is possible that further packages were mailed to additional mail processing facilities in the Washington, D.C. metropolitan area.
It is not clear if the parcels all contained working explosives. According to the Wall Street Journal, some of the packages had letters attached to them, which included "ramblings" written by the mysterious sender. A United States official said a Naval Support Facility in Dahlgren, Virginia, also received a suspicious package and that the FBI is leading the investigation.
Army Lt. Col. Michelle L. Baldanza says the incident is under investigation and the Pentagon was referring all inquiries to the FBI.
Offer on Pixel 2 XL
Seemingly caused by the Android 8.1 update, this bug causes the phone to subject itself to potentially risky charging states. In addition to this, buying a Pixel 2 or 2 XL by March 31 will also make you eligible to get a free 18W USB-C power adapter.
Meghan Markle Hints at Having Babies of Her Own
Prince Harry and Meghan Markle watched performances and met young people to hear their "Peace Pledges". I wonder if he has witnessed bath time with his nephew [Prince George] or niece [Princess Charlotte].
YouTube aims to "frustrate" music fans with more ads
The exercise of what amounts to censorship, then, can legitimately be viewed as the stifling of commercial free speech. Google-owned video platform, YouTube , has released new policies on content featuring firearms .
Apple Develops MicroLED Displays For Apple Watch
Apple is developing its own device displays for the first time in an unmarked facility in Santa Clara, Bloomberg reported. For an entire year, Apple has shut down a project and engineers since then have worked very hard on the technology.