'Significant' fire on 50th floor of Chicago's John Hancock building [photos, video]

Police and firefighters have cordoned off the area around the John Hancock building in Chicago after a fire on the 50th floor:

Fire at John Hancock building in Chicago https://t.co/HzIb86Oxoc pic.twitter.com/UzSugJTGtb

— Greg Pollowitz (@GPollowitz) November 21, 2015

Mt @Josh_Frydman View from my apartment building. Fire in the John Hancock building @WGNNews pic.twitter.com/VnXFZ8pEpJ

— NYC EMS Watch (@NYCEMSwatch) November 21, 2015

#hancocktower #chicago @ABC7Chicago @SchulteABC7 pic.twitter.com/eubY8eVIPk

— Chris (@cdossantos5) November 21, 2015

Hancock building fire … ? pic.twitter.com/diSg46FGzg

— ?????? (@Rachmbeau) November 21, 2015

There is smoke coming out of the John Hancock Tower in downtown Chicago. Lots of fire trucks on the scene. pic.twitter.com/BAv4XOYnVB

— Mitch Smith (@MitchKSmith) November 21, 2015

https://twitter.com/royalpratt/status/668174788209176577

The fire has reportedly been put out:

Fire in the Hancock Bldg. is out. Crews are now cleaning up the area. #Chicago

— Bill West (@BillWest5) November 21, 2015

MORE: #Chicago FD says the fire's out at the Hancock Building. At least one person being treated for smoke inhalation

— Steve Grzanich (@SteveGrzanich) November 21, 2015

Fire is out at the Hancock Center. Lots of smoke. One person taken to Northwestern Hospital.

— Daniel Lopez (@4danlopez) November 21, 2015