UN experts are to destroy four plastic containers filled with mustard gas registered by previous UN disarmament inspectors and recently found north of Baghdad. Spokesman Hiro Ueki said chemical experts had visited the Al-Muthanna military site today to prepare for the destruction of the containers. Ten 155 millimetre artillery shells will also be destroyed. "The destruction process will begin tomorrow and is expected to (take) four to five days to complete," he said.