From Josh Boyajian:
Here are my pictures from last night!

Tower Ladder 5 was in a spare apparatus last night. They were at the corner of Sectors 1 and 4. Josh Boyajian photo

Sector 1 fully involved. Josh Boyajian photo

A deck gun in use from Engine 49. Josh Boyajian photo

A view looking at Sector 1 from the Ashland Avenue Frontage Road. Josh Boyajian photo

A multi-versal works by Engines 49 and 8, both of which are operating deck guns. Josh Boyajian photo

Engine 29 from deploys a deck gun at 36th Street and the west frontage road of Avenue. Josh Boyajian photo

A view from underneath the Ashland Avenue bridge looking down 38th Street after a portion of the fire building collapsed. Josh Boyajian photo
From Jeff Rudolph:
Some pics from last night, Jeff R

Huge fire seen in Sector 3 well after the interior collapsed. Jeff Rudolph photo

A firefighter from Engine 8 coated with ice. Jeff Rudolph photo

Squad 1A with a master stream in Sector 3. Jeff Rudolph photo

Truck 33 with an elevated master stream in Sector 3. Jeff Rudolph photo

Engine 8 icing up in Sector 1. Jeff Rudolph photo

Firefighters on Truck 33 in the rear. Jeff Rudolph photo
ABC Chicago has an article HERE.
A Chicago Fire Department spokesman said a southside warehouse that caught fire Tuesday night will be a total loss.
“Totally involved. … This is a major fire,” read a message posted to Twitter at about 9:50 p.m. Moments later there was a message that a portion of the structure had collapsed.
Firefighters were in “defensive mode” in attacking the fire in a building on the 3700 block of South Ashland Avenue, spokesman Larry Langford said.
But despite his initial, confident remark that the fire would be isolated, flames spread to at least one nearby building. The owner of a printing company, at 3801 S. Ashland Ave., was on the scene and expressed concerns about chemicals inside that could explode.