Egypt has opened a new front in the war against the Islamic State. On Monday, Egyptian warplanes bombed northeastern Libya after Cairo vowed to avenge the killing of 21 Egyptian Coptic Christians, shown in an ISIS video. Egypt says it hit ISIS sites “precisely.” But at least seven civilians, including three children, were reportedly killed in the coastal city of Derna. Egyptian President Abdel Fattah el-Sisi, meanwhile, called for a U.N. resolution to launch a global coalition to intervene in Libya.

Abdel Fattah el-Sisi: “What is going on in Libya could change this country into a breeding ground that will threaten the whole region, and not only Egypt. Egypt, the Mediterranean basin and Europe have to deal with this problem because the mission was unaccomplished, was unfinished by our European friends. We abandoned the Libyan people as prisoners to extremist militias.”

The U.S.-led coalition, meanwhile, launched 15 airstrikes against ISIS in Iraq and Syria on Sunday and Monday.