From CNN.

An estimated 252 Venezuelans who had been imprisoned at the CECOT prison in March were released and returned to their home country in exchange for 10 US nationals and dozens of Venezuelan political prisoners, US officials said. Detainees celebrated their arrival home but also spoke about the conditions they faced – causing the Venezuelan government to open a formal investigation into several Salvadoran officials, including President Nayib Bukele, over the alleged abuse of Venezuelan migrants deported from the US.