NYC's manhole mystery deepens as 3 more men disappear underground

Multiple people were seen dropping into a Manhattan manhole early Sunday morning, according to police, marking yet another incident in recent weeks involving people entering or exiting manholes across New York City.Police are searching for three men seen entering a manhole on West 141st Street, in New York City's Hamilton Heights neighborhood, shortly before 1 a.m. on Sunday, New York Police Department sources told ABC News.By the time police arrived, the men were gone, the sources said.New manh