Mourners sit around one of 17 crosses at a memorial for the victims of the Parkland, FL, shooting.

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young people seated in grass around a cross

Mourners sit around one of 17 crosses at a memorial for the victims of the shooting at Marjory Stoneman Douglas High School in Parkland, Florida, Feb. 16, 2018. Russian bots flooded Twitter in the wake of the shooting to amplify antagonism in the debate over gun control.

Credit:

Jonathan Drake/Reuters