BURNSVILLE, Minn. - Fire crews scrambled to knock down a 4-alarm blaze at a south metro apartment fire overnight Tuesday.

Firefighters responded to the The Pines of Burnsville apartment complex in the 1000 block of West Burnsville Parkway on Tuesday at 1:09 a.m. after reports of a structure fire.

When arriving on scene firefighters found heavy fire pouring from the roof of the apartment building. The status of the fire quickly escalated to 4-alarms. All residents were evacuated from the building.

Crews started attacking the flames from inside and outside the building, eventually knocking it down. Burnsville fire officials say the building was not equipped with a sprinkler system.

Throughout Tuesday morning firefighters were still doing mopup duty and keeping a close eye on the building to make sure hot spots didn't flare up.

According to a Burnsville firefighter, nobody was hurt, but early indications are that residents of at least 18 units will be displaced for an extended period of time while repairs are made.

“Unfortunately, the amount of damage done to the building will keep a few people and families out of their homes for some time,” said Burnsville Fire Chief B.J. Jungmann. “We are working closely with the Red Cross to make sure everyone is taken care of. Our thoughts go out to those impacted, and we are very thankful that no one was injured.”

The cause of the fire is under investigation.