Iraqi Vice President Adel Abdul Mahdi has accused Israel of "massacres" in Lebanon in what is the toughest criticism so far by the Baghdad government.
"These ugly massacres, which are being implemented by the hands of the Israeli aggression, incites in us the spirit of brotherhood, solidarity," he said.
Yesterday's Israeli air strike at Qana killed at least 54 civilians, including 37 children, the biggest single death toll in nearly three weeks of fighting.
Mr Abdul Mahdi called for an immediate end to fighting between Israeli forces and the Shia Hizbullah militants.
"Our area (land) needs security and stability. It needs peace so there has to be an instant ceasefire in Lebanon. All issues should be dealt with in political and peaceful ways, and aggression should be held back and stopped at its limits."
Prime Minister Nuri al-Maliki, also a Shia Islamist, condemned Israel before his trip to Washington last week.