Between Sunni and Shia:

Saudi Arabia’s King Abdullah (front R) welcomes Iranian President Mahmoud Ahmadinejad (front L) upon his arrival at Riyadh airport March 3, 2007. Ahmadinejad arrived in Saudi Arabia on Saturday on his first official trip to the U.S. ally for talks expected to cover the crises in Lebanon and Iraq and Tehran’s nuclear programme. REUTERS/Saudi News Agency/Handout (SAUDI ARABIA)