enforcement officers injured. demonstrators marched through the city, protesting the acquittal of ex-police officer jason stokely and the 2011 shooting death of anthony lamar smith. although the protest was largely peaceful, there were instances of unrest. some protesters clashed with police. others vandalized property, including throwing a rock through the mayor's resident window. and hitting officers with water bottles. cnn correspondent dan simon is in st. louis for us now. so what more do we know about the events that might be planned? >> well hi, fredricka. we'll have to see how the day shapes up, but it's fully anticipated that there will be more protests this afternoon going into this evening. we just learned because of the heavy police presence that's expected to accompany these protesters, that u2, which scheduled a concert here tonight, canceled their event. we just got a statement in from