Chicago teachers, parents and students march for a third day to protest impending school closures. Elizabeth Brackett has the latest on Chicago Tonight at 7:00 pm.

According to the Chicago Teachers Union, 23 people were arrested at City Hall today during a sit-in where they blocked elevators and sang protest songs from the Civil Rights Movement.

Watch the web extra video of protesters singing:

An arrest is made at City Hall:

Earlier in the day, protesters marched in front of a Bronzeville school on their way downtown:

CTU President Karen Lewis is expected to address marchers at a 4:00 pm rally at Daley Plaza, concluding the three-day march to protest school closings.