The incident happened at 4:03 p.m. on Friday at the Wells Fargo on Lancaster Pike.
Gary Boys, a 20-year-old from Hickory Hills in Hockessin, was last seen around midnight and has not been seen or heard from since.
The number of deaths related to Hurricane Irene continues to rise.
Police in northern Delaware have recovered the bodies of two men who went missing early Sunday morning during the height of Hurricane Irene.
The Mt. Cuba Center in Hockessin, DE, offers Twilight Tours of its gardens.