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Students at Mayo High School stage a walkout against gun violence for 17 minutes during the school day Wednesday, Feb. 21, 2018, in Rochester, Minn. The 17 minutes were in memory of the 17 victims in the Marjory Stoneman Douglas High School shooting in Parkland, Fla., on Feb. 14.
Students at Mayo High School stage a walkout against gun violence for 17 minutes during the school day Wednesday, Feb. 21, 2018, in Rochester, Minn. The 17 minutes were in memory of the 17 victims in the Marjory Stoneman Douglas High School shooting in Parkland, Fla., on Feb. 14.

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    Evening news briefing from CNN

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Evening news briefing from CNN

Evening news briefing from CNN on Wednesday, February 21.

Evening news briefing from CNN

Evening news briefing from CNN on Wednesday, February 21.