WASHINGTON — The Frederick County Fire Department says a search for a swimmer at Lake Linganore has turned into a recovery operation.

Battalion Chief Kevin Fox says an 18-year-old man was swimming near Nightingale Beach at about 4 p.m. Friday when he appeared to struggle, and then slipped underwater.

Five boats were involved in the search and rescue operation at the lake, just outside of New Market, Maryland.

Stay with WTOP.com for updates on this developing story.