Spanish authorities announced that they dismantled an organization that had sent more than 5,000 tons of hazardous electronic waste from the Canary Islands to several African countries.

Senegal, Nigeria, Mauritania and Ghana are among the said states.

This waste was then presented as second-hand items to be sent to these African countries.

Spain’s Civil Guard arrested 34 people, including a 62-year-old Italian woman who owned a trading business and allegedly forged custom clearance documents for the arrival and departure of the cargo from the port of Santa Cruz, in Tenerife.

The European police co-ordination body, Europol, and Italy’s Carabinieri also supported the two-year investigation into the environmental crime, a Civil Guard statement said.

The suspects loaded maritime containers with second-hand items such as vehicle parts and household goods. A third of the contents was e-waste. They were sent mainly to Nigeria, but also other African countries, where they were to be sold on to buyers there. The network allegedly sourced the equipment from bins, flea markets and industrial dumps.

The Civil Guard said that informal operations in developing countries, often employing underage workers, use open fires to melt some parts in order to extract aluminum and copper among other minerals that fetch a high value when resold.

Electronic devices can contain cadmium, mercury, lead, arsenic, oils, gases and other substances that can harm the environment or human health when they are not properly handled.