Officials said Darion Marcus Aguilar, 19, of College Park, Maryland, a manager at a Dunkin' Donuts, was behind Saturday's attack that claimed the lives of two employees at a Zumiez store.
The Mall in Columbia in suburban Baltimore was set for a somber reopening later today.
Authorities believe Aguilar, armed with a Mossberg shotgun and "a large amount of ammunition" opened fire in the shopping mall in Columbia, Maryland before killing himself, Howard County Police Chief Bill McMahon said Sunday.
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