UPDATE: Monday, May 12, 2008 --- 7:05 PM

The Janesville Fire Department determined, Monday, a 4-year-old boy, with a cigarette lighter, started Saturday's deadly fire.

Shift commander Tim Ehlers tells NBC 15 investigators believe the fire was accidentally started. He says a 2-year-old was flown by helicopter to Milwaukee, and he has shown "marked improvement." The 2-year-old suffered heavy smoke inhalation.

Both the 2 and 7-year-olds were in first floor bedroom of the apartment. The crew found them inside and handed them out a window. The first floor is where the family lived, and their grandmother lived on the second floor.

Firefighters did not find an adequate number of smoke detectors in the apartment, and noted that the owner will likely be cited for the inadequacy.

Ehlers says that smoke detectors are by statute something that must be present - building owners must provide them, and it is up to the tenant to make sure the battery is working.

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UPDATE: Saturday, May 10, 2008 -- 2:00pm

**JANESVILLE POLICE REPORT**

On May 10, 2008, the Janesville Police Department responded to assist the Janesville Fire Department with a residential fire at 327 N. Palm Street. The residence is a two unit apartment.

7-year-old Derek R.J. Mattingly died as a result of the fire. A 2-year-old boy was transported by MedFlight to a Milwaukee hospital. A 4-year-old boy escaped with his father, Scott Ashmore. The boys' mother, Kristarra Mattingly, was not home when the fire was reported.

The cause of the fire is under investigation.
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POSTED: Saturday, May 10, 2008 -- 1:30pm

A 7-year-old boy died when a fire hit a home on Janesville's west side.

Firefighters said the victim's 2-year-old brother was hospitalized after the fire was reported Saturday about 8 a.m.

Deputy Fire Chief Jim Jensen said the boys' father, another brother described as a toddler, the boys' grandmother and another person escaped.

The cause of the fire was not immediately determined.

(Copyright 2008 by The Associated Press. All Rights Reserved.)