Egyptian and Libyan aircraft on Monday hit suspected Islamic State positions in Derna in Libya, reportedly killing at least 50 militants as well as several civilians.
The General Bishop of the Coptic Orthodox Church in the UK has said we must pray for and forgive Islamic State militants in the wake of a video purporting to show the beheading of 21 Egyptian Christians by the terrorist group.
A retired US intelligence official has said there is a real Islamist presence in Libya, and that it could be affiliated with the Islamic State of Iraq and Syria.
The Archbishop of Canterbury has condemned the "terrible cruelty" of the murder of 21 Coptic Christians in Libya, as well as the killings in Denmark and Nigeria over the weekend.
Egypt's military said in a statement on state television it had carried out an air strike against Islamic State targets in Libya at dawn on Monday, a day after the group released a video appearing to show the beheading of 21 Egyptians there.
An Egyptian court sentenced 183 supporters of the outlawed Muslim Brotherhood to death on Monday on charges of killing police officers, part of a sustained crackdown by authorities on Islamists.