Egypt has declared a three-month state of emergency on the Sinai Peninsula, after more than 30 soldiers were killed in two attacks there.
It is one of the biggest losses of life in decades for the country's army.
President Abdel Fattah al-Sisi also announced three days of national mourning to mark the attacks.
It is thought a group of 30 people were killed in a co-ordinated attack at an army checkpoint near the northern town of el-Arish on Friday.
In another attack, two soldiers were killed by gunmen at a checkpoint south of el-Arish.
There have been a series of militant attacks against security forces in Egypt since President Mohamed Morsi was overthrown by the military last year.
In a presidential degree, it was announced that following yesterday's attack "the army and the police will take all necessary measures to tackle the dangers of terrorism and its financing, to preserve the security of the region… and protect the lives of citizens."
Sky's Zein Ja'far is in the capital Cairo: