was fuelling
Past progressive conjugation of fuel. There are other translations for this conjugation.

fuel

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According to the United States Department of Justice, production in Canada was the primary source of MDMA in the United States, and was fuelling a rise in MDMA smuggling through the border between the two countries.
Según el Departamento de Justicia de los Estados Unidos, el MDMA hallado en los Estados Unidos procedía principalmente de la producción de MDMA en el Canadá, producción que exacerbó un aumento del contrabando de esa sustancia a través de la frontera entre ambos países.
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