FOND DU LAC - Police in Fond du Lac say a fire that caused more than $10,000 damage to playground equipment at a city park was intentionally set.
It happened at Hamilton Park around 8 p.m. Sunday.
Police say they want to talk to four people seen in the area before the fire.
"It was fun times, good fun times," said Amanda Holzman, Fond du Lac.
Holzman says she and her son visit Hamilton Park in Fond du Lac almost every day.
"We come here and play. We chase each other all over, and swing, and have fun," said Holzman.
But Sunday night that changed.
"We heard a big bang, and we came outside and the park was in flames," said Holzman.
"At this point it appears that this is an arson fire. We are looking to speak to four individuals that were seen in the park just prior to the fire breaking out. At this point, two males, two females is the description that we have on these individuals," said Steve Klein, assistant chief of operations with the Fond du Lac Police Department.
When crews arrived, the fire chief says the area was fully involved. Not only was the playground equipment on fire, but so were rubber chips, used for padding in that part of the park.
"The initial fire was put out pretty quick. It was just making sure that all the hot spots, that were just like a tire fire, like in a tire factory, they can burn for quite some time," said Fond du Lac Fire Chief Peter O'Leary.
O'Leary says firefighters were on scene for two hours.
The Fond du Lac Fire Department provided FOX 11 photographs showing melted equipment.
It is not the first time Hamilton Park has been vandalized. The public safety memorial was damaged less than a year ago. Police say the memorial was undamaged in Sunday's fire.
Meanwhile, police detectives sift through the rubble, looking for anything that may lead them to a cause of the fire.
"It is disturbing when you see these types of crimes. It just doesn't make sense," said Klein.
Those who use the park may have to go elsewhere, but they say they will be back.
"When it gets up and running again, definitely, and I hope the city can put it back together," said Holzman.
The park superintendent says the city's insurance will cover the cost of the playground equipment.
It could be a month before the equipment is replaced.
Anyone with information is asked to call Fond du Lac police at (920) 906-5555.
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