DUBAI, Aug. 31 -- Iran's new supreme leader, Ayatollah Mojtaba Khamenei, urged Muslim cooperation and unity in a letter to religious leaders from Islamic countries attending a conference in Tehran, Iran's official IRNA news agency reported. Khamenei called the US and Israel enemies of all Islamic nations. "My enduring and repeating advice to rulers of Islamic nations is to know your real enemy, understand its plans and confront it," he wrote. Six months after the US and Israel attacked Iran, killing Khamenei's father, he has not been seen publicly. AP...