A scandal broke out when it was learned that a poisonous sealing compound "Rhoca-Gil" was used during construction. This substance was linked to the death of nearby livestock. Rhoca-Gil contains acrylamide, a toxic chemical that is mutagenic and possibly carcinogenic. The main contractor, Skanska, took no special precautions for the sealant, nor did it tell its own workers or the local population of the risks. By October 1997, local cattle and fish started dying and workers were becoming ill. The local press started an investigation. After tests were done showing high levels of acrylamide contamination, the site was declared a high risk zone and the sale of agricultural products from the region was banned. Skanska, along with Rhone-Poulenc and Swedish Railways all had criminal charges brought against them; some senior executives resigned as a result.