A Katyusha rocket landed in Baghdad's heavily fortified Green Zone, causing damage to an empty building and no casualties, Iraqi police sources said on Saturday.
Sirens blasted from the US embassy inside the zone, which houses government buildings and foreign missions, and helicopters were hovering above, the sources said.
It was the second such attack this week after three rockets landed in the Green Zone on Thursday, also causing no casualties.
Washington blames such attacks on Iranian-backed militia groups. Iran has not directly commented on the incidents but little-known groups believed to be connected to Iran-aligned militias have claimed some attacks.
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