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.

Italy detained a Libyan suspect on the back of an ICC arrest warrant, but he was swiftly released and flown home to Tripoli.

Ossama Anjiem, who runs a major Libyan prison, was in Italy to watch a soccer match. He returned home after an Italian court found issues with the warrant for his arrest.