police lining up in riot gear. >> we're the people that run towards danger instead of running from it. >> reporter: last night a small group of heavily armed men walked into the group of protesters, calling themselves the oath keepers. the men say they're protecting with infowars, a site run by conspiracy theoryists. >> they mix in with a lot of the peaceful protesters, so it is difficult. and particularly for law enforcement who has no idea oftentimes who is who. >> reporter: tensions growing after a reported four shootings sunday night. 18-year-old tyrone harris remains in critical condition after being shot by police late sunday. of course, carol, there's a rel