TORONTO — At odds over how to strengthen the global recovery, top world leaders found common ground on foreign policy Saturday, condemning North Korea for the alleged sinking of a South Korean warship and endorsing a five-year exit timetable for Afghanistan. In a joint statement, the leading eight industrial democracies also criticized both Iran and North Korea for continuing their nuclear march and called on both to heed existing United Nations resolutions. The statement on the March sinking of the South Korean ship was not as strongly worded as the United States and some other countries had hoped. Russia was cited as a holdout against tougher language. While earlier demonstrations had been nonviolent, black-clad protesters broke off from a larger crowd on Saturday, torching police cruisers and smashing windows with baseball bats and hammers. Some demonstrators hurled bottles at police. "This isn't our Toronto and my response is anger," Mayor David Miller told CP24 television.