The bombs, in a Shi'ite district of the Iraqi capital, also wounded at least ten people. The blasts broke a relative calm since Iraqi and American forces began a security crackdown in the city.
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Meanwhile, a U.S. newspaper says captured documents indicate that insurgents in Iraq have a carefully planned strategy of trying to shoot down coalition aircraft.
"The New York Times" reports Sunday that some of the recent downings of American helicopters in Iraq were part of an insurgent plan to "concentrate" on anti-aircraft attacks.
The paper says U.S. officials learned of the strategy from documents allegedly written by the group al-Qaida in Iraq.
The officials say the documents, seized near Baghdad, contained plans for attacking aircraft using machine guns, rockets and surface-to-air missiles.
The paper quotes U.S. officials as saying attacks on coalition aircraft are likely to increase as American forces expand their efforts to secure Baghdad.
Some information for this report was provided by AFP, AP and Reuters.