Clash in Chicago: Police and anti-war protesters clashed outside a Public Enemy rap concert in Chicago early Sunday, resulting in 18 arrests. Police reported that people ran across the street once the concert had ended, set up an anti-war banner and began yelling and throwing objects. Police said they asked the group to disperse but that protesters refused. Concertgoers had a different story. Witnesses said that police aggressively pulled down the banner and began arresting the protesters. A formal complaint about police handling of the incident has been filed.