A fire is being reported at the John Hancock Center in Chicago, a 100-story skyscraper and the seventh-tallest building in the U.S.

Tourists and onlookers have been posting images of the blaze on social media, with some users reporting that the fire is on the 50th floor.

Hancock tower in Chicago is on fire. Any idea what is going on? @CNN @WGN pic.twitter.com/TBSUwsTpH6 — JASON KIDD (@JKIDD955) November 21, 2015

Fires getting worse at John Hancock building Chicago pic.twitter.com/fzyS4mPc6p — TBlake (@TheRealTBlake) November 21, 2015

We have reached out to the building’s management and will update this post when we hear back.

Update 4:37 p.m.

According to Chicago’s WGN TV, firefighters have extinguished the fire. At least one person was injured, and has been taken to Northwestern hospital. The cause of the fire has not yet been announced.

[Image via Instagram]