COLUMBIA, Md. (AP) — A Maryland mall will remain closed today as police continue to look for a motive in the shooting deaths of two skateboard store employees by a gunman who later killed himself.

Police used dogs to search the mall in Columbia overnight, which is standard procedure.

Police say they also disabled crude attempts at explosive devices that were found in a bag carried by a gunman.

A news release late Saturday night says investigators searched the gunman's bag inside the store where the two employees were shot. They found and disabled what they describe as "crude devices that appeared to be an attempt at making explosives using fireworks."

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