The eliminated terrorists are from eight nationalities, namely Algerian, Tunisian, Egyptian, Malian, from Niger, Canadian and Muaritanian, said Algerian PM in a press conference.

Thirty-seven foreign hostages were killed during the terrorist attack, said Sellal.

Seven victims, among 37 killed, have not been identified yet, he said, adding that five foreign workers were reported missing.

"We don’t know if the missing workers are dead or hidden somewhere in the gas complex, which stretches over 10 hectares," he said.

The natural gas complex of Tiguentourine employed 790 people, including 134 foreigners from 26 nationalities.

The terrorist attack had been planned two months ago and the terrorist group was led by Bencheneb Amine and came from northern Mali.

Sellal said that the gas complex of Tiguentourine didn’t sustain important damage during the attack, hailing "professionalism and intelligence" of the special forces of the People’s National Army (ANP) in their raid to free the hostages.

The terrorist operation aimed at "shaking Algeria’s stability and security, which cannot be accepted," he said.

Sellal asserted that the credit for the success of the hostage release operation "goes to the highest authorities of the State, especially President of the Republic Abdelaziz Bouteflika, who followed the development of the situation hour by hour, and also to the Algerian Army."

Prime Minister Abdelmalek Sellal on Monday urged the Algerian people for "extreme vigilance" to counter the terrorist threat in the wake of the terrorist attack and hostage-taking at Tiguentourine gas field (In Amenas, Illizi).