“Multiple law enforcement sources told DailyMail.com there was a credible threat against Trump from groups of protesters who planned to storm the stage”
Read more: http://www.dailymail.co.uk/news/article-3488651/Trump-rally-called-Chicago-credible-threat-protesters-planned-storm-stage-Trump-s-speech-black-protester-bloodied-St-Louis.html#ixzz42iQiAM2q
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While this story doesn’t mention the number, I heard 20.
Thanks.