Nicolás Maduro’s regime on Friday released six American citizens imprisoned in Venezuela after the strongman met in Caracas with President Donald Trump’s special envoy, Richard Grenell.

A State Department official said Venezuela must take back “Venezuelan criminals and gangs” and release American “hostages” immediately.

Six Americans who had been detained in Venezuela in recent months were freed by the government of President Nicolás Maduro after he met Friday with a Trump administration official tasked with urging the authoritarian leader to take back deported migrants who have committed crimes in the United States.