The Tournament of Roses officials said a preliminary investigation into the small fire indicated it may have been caused by leaking transmission fluid.
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The creators of the float - the Chinese American Heritage Foundation - may also be fined for the fire and delay.
Rose Parade 2019: Small fire erupts on float as procession makes its way through Pasadena
As part of the rules of the Rose Parade, any float that causes a delay in the route faces fines, but officials said the actual fine amount won't be released.
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The 90-foot float was heading through the intersection of Orange Grove Boulevard and West Green Street when the small fire started. It was quickly extinguished and no lasting damage was done to the float.
The disabled float brought the parade to a brief halt and it never finished the route, according to officials. It was later towed to a display location along Sierra Madre and Washington boulevards.