BAGHDAD—Fighting in Baghdad's Shi'ite slum of Sadr City made April the deadliest month for Iraqi civilians since last August and for U.S. troops since last September, figures obtained on Wednesday showed.

Iraqi Health Ministry figures showed 968 civilian deaths in April, the most in eight months. On Wednesday the U.S. military reported the deaths of five more of its soldiers in Baghdad, raising its monthly toll to 49.

Most of the U.S. and Iraqi deaths were in the capital, where U.S. and government forces have been fighting Shi'ite militants loyal to anti-American cleric Moqtada al-Sadr in the tightly-packed Sadr City slum and other Shi'ite areas.

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U.S. forces said they killed another 16 fighters in gunfights, tank battles and strikes from drone aircraft, following heavy fighting on Tuesday in which they killed 34.

Prime Minister Nuri al-Maliki, who launched a crackdown against Sadr's Mehdi Army militia a month ago in the southern city of Basra, said on Wednesday the government would disarm the fighters by force if they refuse to lay down their weapons.

Two hospitals in Sadr City said they alone had received the bodies of 421 Iraqis killed and treated more than 2,400 wounded since late March. Many of the dead and wounded have been civilians, caught in the crossfire in the crowded slum.

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