first place? joe johns is in columbia, maryland, with the very latest. >> reporter: saying he wanted something for home defense, darion aguilar legally purchased a mossberg .520-gauge shotgun and 48 shotgun shells. the owner of the united gun shop tells cnn there were no red flags. both times aguilar visited the shop he was accompanied by a friend. today at the scene of the shoot a makeshift memorial not far from the place where 21-year-old brianna benlolo and 25-year-old tyler johnson were shot to death by aguilar. columbia mall reopened this afternoon for the first time since the shooting, though the store where the shooting occurred was boarded up until further notice. customers said it was a sign of the times. >> and it can happen anywhere. >> reporter: police are still searching for a motive. they say aguilar's journal told them something about his state of mind but not about his plans. >> we retrieved a number of items of evidence, and included in that was a journal.

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