Iran’s Supreme Leader issued a religious decree to Muslims around the world on Sunday, ordering them to defend Palestinians in Gaza against Israeli attacks “in any way possible”, state television reported.Ayatollah Ali Khamenei also declared Monday a day of public mourning in Iran after Israel killed more than 280 Palestinians in two days of air strikes on Gaza.”All Palestinian combatants and all the Islamic world’s pious people are obliged to defend the defenceless women, children and people in Gaza in any way possible,” Khamenei said.”Whoever is killed in this legitimate defence, is considered a martyr,” he said in a statement.