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Rocket attack hits base housing U.S. troops in Iraq

A barrage of rockets hit a base housing U.S. and other coalition troops north of Baghdad, Iraqi security officials said Saturday, just days after a similar attack killed three servicemen, including two Americans.

Iran-backed Shia militia groups had vowed to exact revenge for Friday's U.S. strikes

Iraqi security forces demonstrate their skills during a graduation ceremony at military base Camp Taji in Baghdad in this file photo from Feb. 21, 2016. (Ahmed Saad/Reuters)

A barrage of rockets hit a base housing U.S. and other coalition troops north of Baghdad, Iraqi security officials said Saturday, just days after a similar attack killed three servicemen, including two Americans.

There was no immediate word on casualties at Camp Taji, according to the officials, who spoke on condition of anonymity in line with regulations.

The officials said over a dozen rockets landed inside the base, some struck the coalition quarters while others fell on a runway used by Iraqi forces.

The attack was unusual because it occurred during the day. Previous assaults on military bases housing U.S. troops typically occurred overnight.

The earlier attack against Camp Taji on Wednesday prompted American airstrikes Friday against what U.S. officials said were mainly weapons facilities belonging to Kataib Hezbollah, the Iran-backed militia group believed to be responsible.

However, Iraq's military said those airstrikes killed five security force members and a civilian.

Iran-backed Shia militia groups vowed to exact revenge for Friday's U.S. strikes, signalling another cycle of tit-for-tat violence between Washington and Tehran that could play out inside Iraq.

Katyusha rocket launchers found by the Iraqi Army are seen in Umm al-Izam, in this picture provided by Iraqi Media Security Cell on Saturday. (Iraqi Media Security Cell via Reuters)

Wednesday's attack on Camp Taji was the deadliest to target U.S. troops in Iraq since a late December rocket attack on an Iraqi base. That attack killed a U.S. contractor and set in motion a series of attacks that brought Iraq to the brink of war.

After the contractor was killed, American airstrikes targeting the Kataib Hezbollah led to protests at the U.S. Embassy in Baghdad.

A U.S. drone strike in Baghdad then killed Iranian Gen. Qassem Soleimani, a top commander responsible for expeditionary operations across the wider Mideast. Iran struck back with a ballistic missile attack on U.S. forces in Iraq, the Islamic Republic's most direct assault on America since the 1979 seizing of the U.S. Embassy in Tehran.

The U.S. and Iran stepped back from further attacks after the Soleimani incident. A senior U.S. official said in late January, when U.S.-Iran tensions had cooled, that the killing of Americans constituted a red line that could spark more violence.