NATICK (CBS) – There was a heavy police presence at malls in the Boston area after social media posts called for looting.

Dozens of officers patrolled outside of the Natick Mall Monday night. They said they were concerned about a group of vehicles parked in the lot, but no specific threats were made.

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Police were spotted patrolling several other shopping areas late Monday, including the South Shore Plaza in Braintree, Assembly Row in Somerville, Fresh Pond Mall in Cambridge and South Bay Center in Dorchester.

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The extra patrols came a day after businesses were looted in Boston.