The animal, which was caught on camera in Aquetong Spring Park in Solebury Township, is about 20 inches tall with black hair, police said.
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Police said they are now looking to see if anyone in the area is missing a large black domesticated cat.
Anyone who sees the animal is asked to stay far away and contact police at 215-328-8511.
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Police said they briefly closed the park on Wednesday after a concerned citizen spotted the animal roaming the trails.
The park reopened a short time later.