Chicago Police arrested 11 teens Wednesday night after an attack on the Near North Side.



Police said a group of teens beat up a man in the 700 block of North Dearborn at 11:21 p.m. A 15-year-old teen "punched a 21-year-old man for no reason as the rest of the teens egged him on," police said in a statement.



The man fell, striking his head, and officers called for medical assistance. Police said officers chased the teens, and the 15-year-old resisted arrest, striking several officers with closed fists and kicks, police said.



The 15-year-old was charged with felony aggravated battery, two counts of felony aggravated battery to a police officer and three felony counts of resisting arrest, police said.



Ten others, including Darnell D. Johnson, 18, of the 11000 block of South Esmond Street, as well as a 17-year-old, six 16-year-olds, a 15-year-old and a 14-year-old were charged with one count of misdemeanor mob action and violence to a person.



The victim is recovering at Northwestern Memorial Hospital and was listed in good condition.



As police investigate the incident, area residents told NBC Chicago the so-called mob attacks have made them more cautious in their neighborhoods.



"I feel the tension on the street," said Marinia Kadlec, who decided against taking her kids to the beach Wednesday for fireworks because she feared something like this might happen.



Patrick Carrol, who lives at Superior and Dearborn where the attack occurred, said he was walking home from dinner and witnessed the chaos in the area.



"A lot of kids were out here," Carrol said. "I've never seen anything like it."



Chicago has experienced violent weekends since Memorial Day.



Seven teens and a man were arrested last month in connection with separate mob attacks in the 500 block of North State Street and on the Red Line.



They were charged with beating and robbing a 36-year-old tourist and 44-year-old local in one incident and a man at State and Lake in another.



Since 5 p.m. Tuesday, 23 people were shot in Chicago over the Independence Day holiday.