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I know it is early to trust news sources
but TWO shooters is rare. There are exceptions like Columbine and McVeigh/Nickols but usually it is a lone nutjob (Tyler Robinson, Audrey Hale, James Hodgkinson, Brenton Tarrant, Robin Westman) or larger teams (19 jihadis on Sept 11, Bataclan, First world trade center attack).