By Osmary Hernandez, Michael Rios, CNN

(CNN) — For months, they say, they were beaten by prison guards, shot with pellets, deprived of adequate medical care and denied any due process inside El Salvador’s Center for Terrorism Confinement.

“(The guards) tortured us physically and psychologically,” said José Mora, one of 252 Venezuelan migrants recently held at the notorious mega-prison known as Cecot, after being deported there by the US.

“It was a nightmare. I heard many brothers asking for help, shouting, ‘Mom, help!’” added Rafael Martínez, another detainee.

That four-month “nightmare” ended on Friday, when El Salvador agreed to release all 252 migrants as part of a prisoner exchange deal between the US and Venezuela.

Mora and Martínez are now reunited with their families in Venezue

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