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WASHINGTON (WUSA) -- Friends Of The National Zoo are warning that traffic may be heavy around the Smithsonian's National Zoo.

FONZ says starting Wednesday evening drivers may run into delays due to the Annual Boo at the Zoo. The zoo, located at 3001 Connecticut Avenue NW in D.C., will close early, at 4:30 p.m., and reopen for Boo at the Zoo guests at 5:30 p.m. The event ends at 8:30 p.m.