US President Donald Trump's aggressive but fast-changing trade policy has foisted difficult questions on carmakers that they have not yet been forced to answer.

Foreign Minister Abbas Araghchi said Wednesday that Iran's enrichment of uranium as part of its nuclear programme was "non-negotiable" after US Special Envoy Steve Witkoff called for a halt.

A Swedish teen has been charged in Australia, accused of using encrypted communication apps to help plan contract killings in Sweden and Denmark, said Australian, Danish and Swedish police Wednesday.