The jihadists in Egypt’s Northern Sinai had killed hundreds of soldiers and police officers, pledged allegiance to the Islamic State, briefly seized a major town and begun setting up armed checkpoints to claim territory. In late 2015, they brought down a Russian passenger jet.

Egypt appeared unable to stop them, so Israel, alarmed at the threat just over the border, took action.

For more than two years, unmarked Israeli drones, helicopters and jets have carried out a covert air campaign, conducting more than 100 airstrikes inside Egypt, frequently more than once a week — and all with the approval of President Abdel Fattah el-Sisi.