Minneapolis firefighters battling blaze at vacant apartment building with 'squatters' inside

Minneapolis firefighters working on an apartment fire on Lyndale Ave Saturday morning. (FOX 9)

Firefighters in Minneapolis are working to put out an extensive fire in a boarded-up apartment building on Saturday morning that was supposed to be vacant but had people inside.  

The Minneapolis Fire Department said crews responded to a report of smoke coming from a four-story apartment building located on the 2300 block of Lyndale Avenue South just after 6 a.m.

Upon arrival, firefighters saw heavy smoke coming from the second floor and found fires on two floors. Firefighters started searching and evacuating the building, which was supposed to be vacant, but there were "several squatters inside the building," according to a tweet from the fire department. 

One person jumped from the second-floor window and is in stable condition, according to fire officials. 

Firefighters evacuated the building for safety after the fire spread to all floors. 

Crews were still working on putting out the fire, which they say is showing through the roof that has partially collapsed. The exterior wall also collapsed into the alleyways, according to the fire department.

Aerial water towers have been set up to put large amounts of water on the fire. As of 9:30 a.m., crews are still working on extinguishing the fire. 

The Minneapolis Fire Department has not said what caused the fire. 

The Minneapolis Fire Department said crews battled a blaze Saturday morning at a vacant four-story apartment building with "squatters" inside.  (FOX 9 / FOX 9)

This is a developing story, check back for updates.