Pranksters in scary Halloween masks "terrified" a family member in a hoax that needlessly cost more than 100 hours of police manpower — and could've had deadly consequences, authorities near Washington, D.C., said Monday.

A 911 caller on Oct. 14 reported that there were "masked individuals" making threats at her door on South Iris Street in Alexandria, Virginia, according to a police statement.

"They were absolutely terrified when this happened and occurred," Alexandria Police Chief Tarrick McGuire told reporters on Monday.

As video of the scary Halloween encounter — captured on the home's doorbell camera — went viral, “multiple community tips” helped investigators learn the three masked people were boys, ages 14 to 16, who were two sons and a nephew of the prank's perpetrator, a cousin

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