UPDATE (WKOW) -- The firefighter who was in critical condition is doing better. The Sun Prairie Fire Department says that person is in stable condition and will survive.
UPDATE (WKOW) -- One firefighter has died and another is in critical condition after an explosion in Sun Prairie.
Sun Prairie police gave the update at 5:30 a.m. Wednesday.
Several other firefighters who responded to the scene of a gas leak also suffered minor injuries when there was an explosion.
The area is still not safe for people, so the 1/2 mile evacuation order is still in order.
UPDATE (WKOW) -- Two firefighters and one police officer were injured when a building exploded in downtown Sun Prairie after crews responded to a report of a natural gas leak.
Several other people received minor injuries that were treated at the command post, according to police.
However, police can't confirm yet that there are no further injuries or fatalities.
Lt. Kevin Konopacki said Tuesday evening that crews were called at 6:21 p.m. to a report of a natural gas leak at the corner of Main and Bristol streets.
After police and firefighters arrived on the scene and began to evacuate people, a building exploded shortly after 7 p.m., injuring one officer and two firefighters, who have been transported to the hospital. There is no word on their condition at this time.
The Barr House and Glass Nickel both sustained severe damage, according to Konopacki.
A contractor hit a 4-inch natural gas main, according to WE Energies spokesperson Amy Jahns. The work was not being done for WE Energies, Jahns said.
About 500 customers were without service Tuesday evening, Jahns said.
A five block area around the scene of the explosion was evacuated while crews attempted to contain the blaze.
An evacuation center has been set up at the high school, according to Konopacki.
27 News will continue live team coverage during Wake Up Wisconsin. Authorities plan to give an update at 5:30 a.m.
UPDATE (WKOW) -- The Sun Prairie Police Department says firefighters are actively fighting a fire at Main Street and Bristol Street and are asking everyone living within a five-block radius to evacuate.
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The Red Cross of Wisconsin says evacuated families can go to Sacred Heart Church & School, 219 Columbus St. for water, snacks and other resources as this situation develops.
Police say this is a rapidly evolving situation. They're asking everyone to avoid the area.
They say they do not know how the fire started. They say they also do not know whether anyone has been hurt.
Authorities called in mutual aid from other agencies in the area -- fire, medical and law enforcement. They are also working with the Red Cross.
Sun Prairie explosion - revised reception site: evacuated families can go to Sacred Heart Church & School, 219 Columbus St. for water, snacks & other resources as this situation develops.— Red Cross - Wisconsin (@RedCrossWIS) July 11, 2018
(NOTE: this is a change from previous site location.)
Chilling video showing emergency vehicle and a far off fireball after the explosion in Sun Prairie. Shot just minutes ago in Sun Prairie, WI. Praying that people are alright.
RIGHT NOW: officials are moving everyone back, going door to door telling people to get at least 5 blocks away from scene. These pictures were shot by alderman who was inside City Hall at time. #WKOW