How does @CBS know that everyone @DHSgov sent to the prison in El SAlvador was Venezuelan? Did the US Government release any details about the 280 men

How does @CBS know that everyone @DHSgov sent to the prison in El SAlvador was Venezuelan?

Did the US Government release any details about the 280 men sent?

Only 252 were released to Venezuala after four months in the torture camp. https://x.com/brianstelter/status/2003109385367601520