The US has repatriated a detainee from its military prison at Guantanamo Bay in Cuba to Tunisia, the Pentagon announced Monday, the fourth detainee to be transferred this month.

Ridah Bin Saleh al-Yazidi had been cleared for transfer more than a decade ago, though bureaucratic delays and political hurdles prolonged his detention.

A prisoner who has been held at Guantanamo Bay since the day it opened over 20 years ago has been released, the Pentagon said. Ridah bin Saleh al-Yazidi’s transfer back to Tunisia was approved more than a decade ago, and he was never charged, but authorities have only just confirmed his repatriation.