CAIRO Four Egyptian soldiers were killed in an explosion that hit their armoured vehicle on Saturday in the northern Sinai peninsula, where the government is battling an Islamic State-led insurgency, security sources said. The incident occurred about 20 km south of the town of al-Arish. An insurgency in Sinai region has gained pace since the army toppled President Mohamed Mursi of the Muslim Brotherhood, Egypt's oldest Islamist movement, following mass protests against his rule in mid-2013. The revolt, mounted by Islamic State's Egyptian branch, has killed hundreds of soldiers and police. Militants have also started to attack Western targets within the country. (Reuters)