Federal law-enforcement officials have arrested a Seattle man in connection with suspicious packages sent recently to several Washington-area US government mail-processing facilities, and they are warning residents to remain cautious about any unexpected or unfamiliar parcels that might arrive on their doorsteps.
In a statement, an Army spokesman said a suspicious package was received at the National Defense University at 8:30 a.m. Monday on the grounds of Fort McNair. An X-ray showed what appeared to be a Global Positioning System and a fuse.
Scanning machines at the facilities detected the suspicious materials upon receipt and the packages are being examined at the Federal Bureau of Investigation lab in Quantico, Virginia, the law enforcement official said. Fort McNair received a suspicious package on March 26, 2018.
The FBI seized the packages that were stuffed with explosive components such as black powder, fuses, and circuit boards. It's not known whether any of the packages contained functional explosive devices.
The investigation continues. According to the FBI, it is possible more packages were mailed to processing facilities in D.C.
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It is not yet clear if the packages are all linked to one another. A fifth person suffered minor injuries when a package bomb exploded at a FedEx facility.
The current scare comes in the wake of the Austin package bombings that left two people dead and several injured.
In the statement, Army Lt. Col. Michelle Baldanza said "this incident is now under investigation".
"We are tracking the delivery of suspicious packages to multiple military installations in the National Capital Region".
A source familiar with the case tells ABC News that at least one of the suspicious packages sent to the military and government facilities included a long, rambling and largely unintelligible message, printed out on white paper.