SALISBURY, Md. (WJZ) — Police in Salisbury are investigating after a threat made on social media referenced a shooting at a Walmart store.

The threat was later determined not to be credible but police are still working with the management at Walmart and have an extra police presence at the store.

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“We are fully aware of the social media post which references a shooting threat at Walmart (North),” the Salisbury Police Department said on Twitter late Friday night.

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A number of threats have been made against Walmart stores nationwide in recent days, including in Pennsylvania and Florida.