A spokesman for the Armed Forces General Command announced the strikes on state radio Monday, marking the first time Cairo has publicly acknowledged taking military action in neighboring Libya, where extremist groups seen as a threat to both countries have taken root in recent years. The statement said the warplanes targeted weapons caches and training camps before returning safely. It said the strikes were "to avenge the bloodshed and to seek retribution from the killers."
"Let those far and near know that Egyptians have a shield that protects them," it said. Libya's air force meanwhile announced it had launched strikes in the eastern city of Darna, which was taken over by an Islamic State affiliate last year.
The announcement, on the Facebook page of the Air Force Chief of Staff, did not provide further details. The video purporting to show the mass beheading of Coptic Christian hostages was released late Sunday by militants in Libya affiliated with the Islamic State group. The killings raise the possibility that the extremist group — which controls about a third of Syria and Iraq in a self-declared caliphate — has established a direct affiliate less than 500 miles (800 kilometers) from the southern tip of Italy.