The beheading of 21 Egyptian Christians by Islamic State’s affiliate in Libya is giving impetus to calls for broader military action against Islamist militants in the oil-rich country. Egyptian President Abdel-Fattah El-Sisi, whose air force bombed Islamic State targets in Libya on Monday, said his country will ask the United Nations Security Council to authorize intervention in the North African nation. Italy, Libya’s former colonial ruler, said it would consider sending a force under a UN mandate. The Egyptian military also deployed soldiers at home to “secure vital institutions and installations,” it said in a statement. Tunisia, Libya’s western neighbor, said helicopters and fighter jets were conducting reconnaissance […]