HARARE (Reuters) - Zimbabwe has seized a U.S.-registered cargo plane with 64 suspected mercenaries of various nationalities and a cargo of "military material", Home Affairs (Interior) Minister Kembo Mohadi said on Monday. "A United States of America-registered Boeing 727-100 cargo plane was detained last night at about 19:30 hours at Harare International Airport after its owners had made a false declaration of its cargo and crew," Mohadi said in a statement.