A black male wearing a dark-colored jumpsuit and a white Jason-type mask threatened a woman early Sunday at her home in the 1000 block of Village Round in Lower Macungie, state police at Fogelsville said.
He rang the doorbell and knocked on her door at 1:50 a.m., and when the woman answered the door, he pointed a large knife at her, motioned and made several statements, police said.
He left in a green-colored sedan with three other males.
He was described as being 6 feet to 6-feeet-4 and weighing 230 pounds. He wore a mask similar to the fictional serial killer Jason in the "Friday the 13th" movie series.
Police did not indicate whether it could have been intended as a Halloween prank, given that several communities were celebrating Trick or Treat this weekend.
Anyone with information is asked to call state police at 610-395-1438.