Venezuela says it is opening a formal investigation into several Salvadoran officials, including President Nayib Bukele, over the alleged abuse of Venezuelan migrants deported from the US.

The more than 200 Venezuelan migrants who were deported by the Trump administration to El Salvador's mega-prison in March have left El Salvador to be sent to Venezuela as part of a prisoner swap that included Americans being held in Venezuela, El Salvador President Nayib Bukele announced on X.

Venezuela's attorney general's office said on Monday that it has opened an investigation into El Salvador's President Nayib Bukele for alleged mistreatment and human rights violations against Venezuelan migrants.