AURORA, Colo. -

Aurora firefighters say fireworks are to blame for igniting a small brush fire at Great Plains Park on the Fourth of July.

KMGH-TV reports that two brothers will be fined for allegedly setting off a model rocket that started the 3-acre fire Thursday.
    
After an investigation, it was determined a model rocket was to blame for starting the 3-acre fire.
    
The Aurora Fire Department said a model rocket is not considered fireworks, but is still illegal. No one was injured in the brush fire.