The Mossberg 500 shotgun used in the Columbia Mall attacks was sold to the 19-year-old shooter at a Rockville gun shop.
Gun shop owners told reporters that there were no red flags to alert them to what transpired on Saturday, when Aguilar killed two employees at a skateboard store at Columbia Mall and then killed himself.
Shop owners told The Washington Post that Aguilar purchased the gun on Dec. 10. He claimed he needed the weapon for “personal defense," according to The Post.
WJLA reported that Aguilar filled out the proper paperwork and was checked against an FBI database, per federal law.
The store owners described him as “polite.”
Federal, state and local law enforcement agencies—including Montgomery County police— mobilized to support Howard County Police Department.
At approximately 11:15 a.m. Saturday, Howard County's 911 dispatch center received more than 40 calls from the mall. Police arrived on the scene within two minutes.
Police found the bodies of Brianna Benlolo, 21, of College Park, and Tyler Johnson, 25, of Mount Airy, inside the Zumiez store.
Five people were taken to Howard County General Hospital for injuries that were not life-threatening; they were treated and released by 5:15 p.m. Saturday.
- Robots, Bomb Squad, Feds Aid Columbia Mall Shooting Investigation
- 3 Dead in Shooting at Columbia Mall, Shooter Identified
- Witnesses Describe Gunshots, Chaos in Columbia Mall Shooting
- Mall-Goers Show Sadness, Respect: 'This is a Faith-Filled Community'
- No Known Motive in Deadly Shooting as Columbia Mall Prepares to Reopen
- 19-Year-Old College Park Man Identified as Columbia Mall Shooter
- Columbia Zumiez Employee: 'She Was One of the Nicest People I've Ever Met'
- Zumiez CEO Issues Statement on Shooting
---Editor's Note: This article includes reporting from Columbia Patch.