Tens of thousands of anti-war protesters demonstrated across Europe on Saturday to mark the second anniversary of the U.S.-led invasion of Iraq, with 45,000 marching from London's Hyde Park past the American Embassy. In Istanbul, Turkey, about 15,000 people protested in the Kadikoy neighborhood against the U.S. presence in Iraq. But the rallies were nowhere near as big as those in February 2003, just before the war, when millions marched in cities around the world to urge President Bush and his allies not to attack Iraq.With international forces still facing violent opposition in Iraq, protesters were divided about what to demand from leaders now. While some wanted a full troop withdrawal, others argued that would leave Iraqis in a worse position than before the invasion. "We got the Iraqis into this mess, we need to help them out of it," said Kit MacLean, 29, waiting near Hyde Park's Speakers' Corner before the London march began. Police estimated about 45,000 demonstrators marched from the park past the American Embassy and on to Trafalgar Square. Some worried Bush might be planning another war in the Middle East or elsewhere. "After Iraq — Iran? Syria? Cuba?" read one placard. "Stop This Man" said another, alongside a picture showing Bush with devil's horns.