Chicago police clashed with demonstrators Sunday, but protesters say they’ll be back on the streets Monday as leaders from the 28 NATO countries meet. At least 45 people were arrested Sunday, and four officers were taken to the hospital, including one who was stabbed in the leg, according to Chicago Police Superintendent Garry McCarthy. “They rallied. They charged the cops, and they assaulted the officers,” McCarthy said. “The finger should be pointed at the people who assaulted the cops.” Some downtown businesses are closed Monday in anticipation of the second day of protests, which is planned to include a demonstration outside Boeing headquarters. Commuters adjusted to changed bus routes and canceled trains, but some workers reported that the morning rush was lighter than usual as employees steered clear of the protest zone.