190 liters of dimethyl methylphosphonate, a CWC schedule 2 chemical used in the synthesis of sarin nerve gas, was discovered in the cargo of El Al Flight 1862 after it crashed in 1992 en route to Tel Aviv. Israel insisted the material was non-toxic, was to have been used to test filters that protect against chemical weapons, and that it had been clearly listed on the cargo manifest in accordance with international regulations. The shipment was from a U.S. chemical plant to the IIBR under a U.S. Department of Commerce license.