CAIRO – Fury over an anti-Islam film spread across the Muslim world Friday, with deadly clashes near Western embassies in Tunisia and Sudan, an American fast-food restaurant set ablaze in Lebanon, and international peacekeepers attacked in the Sinai despite an appeal for calm from Egypt's Islamist president.

At least four people – all protesters – were killed and dozens were wounded in the demonstrations in more than 20 countries from the Middle East to Southeast Asia. Most were peaceful but they turned violent in several nations, presenting challenges for the leaders who came to power in the Arab Spring.

Security forces worked to rein in the anti-American crowds but appeared to struggle in doing so. Police in Cairo prevented stone-throwing protesters from getting near the U.S. Embassy, firing tear gas and deploying armored vehicles in a fourth day of clashes in the Egyptian capital. One person died there after being shot by rubber bullets.