ROME, Jan 23, (AP): Human rights groups voiced outrage Wednesday after Italy released a Libyan warlord on a technicality, after he was arrested on a warrant from the International Criminal Court accusing him of war crimes and crimes against humanity. The Hague-based court, for its part, issued a more diplomatic response but its anger appeared evident.

In a stern statement late Wednesday, the ICC reminded Italy that it is obliged to "cooperate fully” with its prosecutions and said it was still awaiting information about what exactly Rome had done. The reaction came after the Italian government on Tuesday released and sent back home Ossama Anjiem, also known as Ossama al-Masri, who heads the Tripoli branch of the Reform and Rehabilitation Institution, a notorious network of detention centers run by the government-backed Special Defense Force.

Al-Masri had been arrested Sunday in Turin, where he reportedly had attended the Juventus-Milan soccer match the night before. The ICC warrant, dated the day before, accused al-Masri of war crimes and crimes against humanity committed in the Mitiga prison in Libya starting in 2015 that are punishable with life in prison.

The ICC said he was accused of murder, torture, rape and sexual violence. It said the warrant was transmitted to member states on Saturday, including Italy, and that the court had also provided real-time information that he had entered Europe. The court said it had reminded Italy at the time to contact it "without delay” if it ran into any problems cooperating with the warrant.

But Rome’s court of appeals ordered al-Masri freed Tuesday, and he was sent back to Libya aboard an aircraft of the Italian secret services, because of what the appeals court said was a procedural error in his arrest. The ruling said Justice Minister Carlo Nordio should have been informed ahead of time, since the justice ministry handles all relations with the ICC.

The ICC said it had not been given prior notice of the Rome court's decision, as required, and "is seeking, and is yet to obtain, verification from the authorities on the steps reportedly taken.” Al-Masri returned to Tripoli late Tuesday, received at the Mitiga airport by supporters who celebrated his release, according to local media. Footage circulated online showed dozens of young men chanting and carrying what appeared to be al-Masri on their shoulders.