Iraq's Prime Minister Mustafa al Kadhimi's move was praised by the United Nations. The country's parliament must still ratify the election date.
Hisham al-Hashemi was a well-connected security analyst who appeared regularly on Iraqi television and whose expertise was sought out by government officials, journalists and researchers.
The raid was the most brazen action by Iraqi forces against a major Iran-backed militia group in years and targeted the Kataib Hezbollah faction.
An Iraqi official said the rocket had struck near the US Embassy in the Green Zone where government buildings and foreign embassies are located.
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