Syrian tanks stormed the protest-ridden city of Hama Sunday, killing at least 100 in an effort to crush dissent on the eve of Ramadan. The violence marked one of the deadliest days in Syria since the protests began in March. Britain, Germany, France, Italy, and Turkey condemned the violence, and a U.S. diplomat called it "full-on warfare." Human-rights groups estimated at least 142 were killed in the crackdown, which came after 500,000 rallied in the city Friday in a Muslim prayer service that called for the overthrow of the government. U.S. President Barack Obama commented on the atrocities Sunday, saying he was "appalled by the Syrian government's use of violence and brutality against its own people."