The two were removed from the scene by helicopter, police said.
The incident ended when the gunman was fatally shot by police after brandishing a gun at the facilities, the army sergeant. General Michael J. Talley said.
Authorities are investigating both the motive and the circumstances of the incident, Talley told reporters at a press conference in the afternoon. Here’s what we know so far:
How the day went
Frederick Police Chief Jason Lando said the first shooting took place at “a military institution” in Riverside Tech Park.
In a press release, the police department said the building was a warehouse rented by the Naval Medical Research Center of the Biological Defense Research Directorate to store research supplies and equipment.
After the shooting, a victim walked into a nearby business, Nicolock Paving Stones, and called for help, a person said.
“Our team was able to help them and called the authorities,” read a statement issued by Jeremy Mutschler, director of marketing and advertising at Nicolock. The press release points out that the shooting did not take place in Nicolock
The gunman was stopped at the gates of the facility, but before the vehicle could be searched, the gunman took off.
He was stopped about 1/2 mile out of the facility, where he got out of the car, brandished a gun and was shot by police, Talley told reporters.
Frederick Police Chief Jason Lando said the shooter used a rifle but provided no additional information about the weapon.
Frederick is approximately 50 miles northwest of Washington, DC. Woldesenbet was an E-4 and did not live at Fort Detrick, officials said.
Agencies helping Frederick’s police include the FBI; the Bureau of Alcohol, Tobacco, Firearms and Explosives; Maryland State Police; and the Frederick County Sheriff’s Office.
The FBI is handling the first scene of filming, officials said.
CNN’s Jason Hanna, Melissa Alonso, Joe Johns, Amanda Watts and Michael Callahan contributed to this report.