Greece cannot deny people the right to seek asylum, arbitrarily detain them, and summarily send them to Turkey or any other place, said Human Rights Watch on Monday, alleging that Greek authorities have been doing just that.

Greek authorities on Friday gave asylum seekers on board a naval vessel a form to sign for their “immediate readmission to Turkey,” said a statement by Bill Frelick, the head of the group’s refugee program.

Frelick, who monitors, investigates, and documents human rights abuses against refugees and asylum seekers, said the form was in Greek, according to a Syrian contact he has

Read more: Greece railroaded asylum seekers: Rights group