UNITED NATIONS: U.N. officials furiously screening 80,000 pieces of undelivered mail found yet another pair of letter bombs late Monday night. Identical to the two found earlier that day, the bombs were addressed to the U.N. office of Al-Hayat and fitted into greeting card-sized envelopes. U.N. spokesman Fred Eckhard said all four bombs were delivered through the U.S. Postal Service and may have been at the U.N. since last week. Monday brought the bombing campaign's first casualties when one device exploded at the Al-Hayat newspaper's London headquarters; two people were injured, one seriously. At least a dozen letter bombs have been mailed to the newspaper's bureaus in Washington, New York, London and Riyadh this month.