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
Vartiokylä dumping ground waste to the dumping ground, provided that it first neutralized the sulphuric acid waste with calcium oxide. The city urged its public works department to guard the dumping ground more effectively — earlier it was not guarded at all, as was usual at the time — and to immediately take measures so that the hazards posed by the toxic waste already at the site could be minimised. In the summer of 1962 the Vartiokylä dumping ground was closed, but not because of its environmental impact. The official story was that the place was full and could not accommodate further waste