Apple, Google, Tesla and Microsoft are among firms named in a lawsuit seeking damages over deaths and injuries of child miners in the Democratic Republic of Congo.
The case has been filed by the International Rights Advocates on behalf of 14 Congolese families.
They accuse the companies of knowing that cobalt used in their products could be linked to child labour.
DR Congo produces 60% of the world’s supply of cobalt.
The mineral is used to produce lithium-ion batteries used to power electric cars, laptops and smartphones.
However, the extraction process has been beset with concerns of illegal mining, human rights abuses and corruption.