Venezuelans deported from the US to a mega-prison in El Salvador tell the BBC after their release they were mistreated.

A migrant from Venezuela deported by the Trump administration to El Salvador has taken the first step toward suing the U.S. government, saying he was wrongly sent to a notorious prison in the Central American country where he was beaten by guards and kept from contacting his family or an attorney.

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.