Police first got the call around 8:20 a.m. for shots fired inside a Navy office at the Riverside Tech Park on Progress Drive.
"Currently there are two victims and one suspect is down", the Frederick Police Department said on Twitter. Officials at Fort Detrick confirmed those details through a statement on the facilities' Facebook page.
The suspect traveled about a half-mile down the road toward the base before he was shot and killed by Army officials.
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Little is known about the suspect or possible motive, authorities said, as the investigation remains in its early stage. Pelosi ordered the flags at the Capitol to be flown at half-staff in honor of the deceased Capitol Police officer.
There, at the Fort Detrick base about 4 miles away, the alleged shooter was fatally shot by military personnel. A spokeswoman for Shock Trauma at the University of Maryland Medical Center in Baltimore did not immediately respond to an email asking for an update on their conditions.
Police say there is no longer any threat to the community. He then brandished his weapon at officers from the installation's police force who had pursued him. "But you always know, perhaps in the back of your mind, that that's just luck - that there isn't any reason why it couldn't happen here".
Editor's note: An earlier version of this story mistakenly identified Fort Detrick as a Naval base.
Military and civilian law enforcement did not say whether 38-year-old Woldesenbet, a Navy hospital corpsman who was assigned to Fort Detrick, worked at the overflow site in Frederick where he opened fire on fellow sailors, nor did they speculate on the motive behind the shooting. "And now it's happening in our backyards".