Algerian soldiers secure the airport in In Amenas before the departure of freed hostages, Algeria, Jan. 19, 2013. Algerian army's final rescue operation in the gas field of Tiguentourine freed four foreign hostages on Saturday, a security source told Xinhua. (Xinhua/Mohamed Kadri)

Three hostages stand together after being freed in In Amenas, Algeria, Jan. 19, 2013. Algerian army's final rescue operation in the gas field of Tiguentourine freed four foreign hostages on Saturday, a security source told Xinhua. (Xinhua/Mohamed Kadri)

A Cameroonian hostage makes a phone call after being freed in In Amenas, Algeria, Jan. 19, 2013. Algerian army's final rescue operation in the gas field of Tiguentourine freed four foreign hostages on Saturday, a security source told Xinhua. (Xinhua/Mohamed Kadri)