Investigators said the fire Monday night was started by a person, but it was not clear if the fire was intentional or an accident.

Chicago Fire is a show where anything can happen to its characters. It's a firefighter drama where danger is always lurking for the heroes of Firehouse 51, sometimes even leading to death. Jimmy Borelli almost lost his life,

For the first time in five years, “Chicago Med,” “Chicago Fire” and “Chicago P.D.” are crossing over on Jan. 29. Here's how to watch the episodes and the order they're in.

The fire started shortly before 7 a.m. in a two-story apartment building in the 1300 block of West Fuller Street.

We have Chicago Fire to thank for One Chicago Wednesdays. The flagship series kicked off the NBC phenomenon in 2012. Over the last 13 seasons, we’ve come to think of the firefighters and paramedics of Firehouse 51 as family, watching them get married, have kids, and more.

How hard is it to create a three-episode crossover? Chicago Fire showrunner Andrea Martin dishes on that & more in this exclusive interview.

The One Chicago night, as always, caps off with P.D. In “The Good Shepherd,” Intelligence makes a gruesome discovery that leads Torres ( Benjamin Levy Aguilar) to go undercover at the juvenile detention center where he served time as a teen. The promo shows that going awry.

NBC’s One Chicago is airing its first crossover in five years tonight. Here’s how to watch the epic event featuring "Chicago Fire," 'Chicago Med," and "Chicago P.D.."

The crossover starts at 8 p.m. with "Chicago Fire" followed by "Chicago Med" at 9 p.m. and "Chicago P.D." at 10 p.m.

“This is not a crossover night. This is a three-hour film. This is a movie that happens to have all of your favorite One Chicago characters in it,” he dished to Us. “It is so large in scale, it is bigger than anything we’ve ever done. It is insanely impressive.”

Dry, gusty conditions in Northeastern Illinois led the National Weather Service to issue a fire weather watch for the entire Chicago area Monday. Here's a breakdown of what it means.