At least 6 transported to hospital after Level 2 hazmat at building in Loop

CHICAGO — Fire crews are at the scene of a Level 2 Hazmat at an office building in the Loop.

A chlorine leak was reported on the roof of a building located at 77 W. Wacker, just after 10 a.m. Friday.

The Hazmat was quickly upgraded to a Level 2.

The Chicago Fire Department reports at least six people have been transported to Northwestern Hospital. One person refused.

This is a developing story. Check back for details.