Video clip is below. From CNN:

Police say the man arrived at a busy mall in Columbia, Maryland, in a cab, about an hour before he walked into a small shop and fired a shotgun at least half a dozen times, killing two people who worked there.

Why Darion Marcus Aguilar shot two people to death and then killed himself is still a mystery to police. They’re investigating who the 19-year-old man was and whether he even knew the people he shot on Saturday afternoon.

Police said Sunday that Aguilar showed up at The Mall in Columbia in a taxi and stayed in a “generally confined area” before going to Zumiez, a shop that caters to skaters, on the second floor.

There he fired six to nine shots, killing 21-year-old Brianna Benlolo and 25-year-old Tyler Johnson before turning the shotgun on himself.

The shootings, which also left five other people injured, ended a violent week which saw shootings or gun scares at American schools or shopping centers — ordinary places where people once felt safe.

Howard County Police Chief Bill McMahon identified Aguilar as the shooter at a Sunday morning update for reporters.

Aguilar purchased the gun, made by Mossberg, in December, the chief said Sunday.

On Saturday, a federal official briefed on the shooting told CNN that preliminary information indicated the shooting may have been related to a domestic situation.

McMahon said Sunday that police had yet to determine that, but learned Saturday night that Benlolo lived in College Park, Maryland, near the shooter.

Benlolo was an assistant manager at the store and had worked there since November 2012, according to her Facebook page.

Johnson had worked at the store for about three months, according to his Facebook page.

Aguilar also had a backpack that contained two homemade bombs, police said. Both were disabled, authorities said.

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