A landmark legal case has been launched against the world’s largest tech companies by Congolese families who say their children were killed or maimed while mining for cobalt used to power smartphones, laptops and electric cars, the Guardian can reveal.

Apple, Google, Dell, Microsoft and Tesla have been named as defendants in a lawsuit filed in Washington DC by human rights firm International Rights Advocates on behalf of 14 parents and children from the Democratic Republic of the Congo (DRC). The lawsuit accuses the companies of aiding and abetting in the death and serious injury of children who they claim were working in cobalt mines in their supply chain.