A 22 year-old rapper has been arrested on suspicion of shooting and killing six people at a July 4 parade in an affluent Chicago suburb. Robert 'Bobby' Crimo III was intercepted by cops in North Lake Forest, Chicago, after 7pm local time Monday evening when cops saw the silver Honda Fit he was last seen driving. Dramatic photographs from the scene show the suspected mass-murderer - who posted creepy clips about shooting massacres online - being pinned to the ground face-down by police. Cops say Crimo opened fire from a rooftop, into a crowd who at first confused the sound...