Notifies the Security Council that, effective 2 Apr. 1953, Bikini Atoll in the Trust Territory of the Pacfic Islands, is closed for security reasons pursuant to the provisions of the Trusteeship Ageement; encloses press release entitled "Bikini Atoll added to Atomic Proving Ground in Pacific", issued on 2 Apr. 1953 by the Atomic Energy Commission of the United States.