After a lone gunman allegedly killed a former colleague in the vicinity of New York’s Empire State Building on Friday morning, journalists and bystanders quickly began covering the event via social media. Just as quickly, other tweeters attempted to police that coverage, urging discretion and accuracy.

Some of that reaction is Storified below; additions welcome in the comments.

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Kira Goldenberg is an associate editor at CJR. Follow her on Twitter at @kiragoldenberg.