2006 Ivory Coast toxic waste dump then released and charges were dropped against them. Further prosecutions against Ivorian citizens not employed by Trafigura continued. On 6 December 2006, an independent inquiry launched by the City of Amsterdam concluded that the city was negligent when they allowed Trafigura to take waste back on board the "Probo Koala" in Amsterdam in July. Part of the "Probo" cargo was offloaded with the intent to have it processed with an Amsterdam waste processing company but when this turned out too expensive Trafigura took it back. The responsible local civil servants were reportedly unaware of existing Dutch environmental laws that would
2006 Ivory Coast toxic waste dump was registered only days before the arrival of the "Probo Koala", was contracted for €18,500 to dispose of the waste. The company contends that no waste was transported from Europe, and the incident was an accident caused by the mishandling by an Ivorian company of waste water used to wash the ship's storage tanks. A Dutch newspaper reported on this possibility, saying the waste could have been generated as a result of attempted on-board desulfurization (removing mercaptans) of naphtha in a Merox-like process. In this way high mercaptan-laden gasoline is upgraded to meet certain country-specific specifications. This would explain the