VIDEO: Chicago demonstrators protest after black teen shot dead by white police officer

Demonstrators gathered in Chicago to protest against the death of a black teenager shot by a white police officer, an incident captured on video that President Barack Obama called "deeply disturbing".

About two dozen people gathered outside Mayor Rahm Emanuel's City Hall office, a day after the release of a graphic squad-car video showing the officer shooting 17-year-old Laquan McDonald 16 times.