More than 75 animals escaped from the Hackettstown Livestock Auction on West Stiger Street around 9:30 p.m.
Police said the livestock were able to get out when an unsecured gate was pushed open, allowing the animals to freely roam the streets.
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The responding officers helped herd 50 to 60 animals back into their pen with the help of some good Samaritans.
Officers said they re-secured the gate with a piece of rope.
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