The "emir of suicide bombers," senior Islamic State of Iraq and Syria leader Tariq al-Harzi was killed in Syria by a coalition airstrike last month, according to a Pentagon official.

The 33-year-old Tunisian al-Harzi is believed to be one of the first of the Islamic State's many foreign fighters. He helped raise funds for the militant group from wealthy Gulf patrons, including a $2 million donation from a donor based in Qatar, the Pentagon said.

Harzi also helped procure and ship weapons from Libya to Syria, the Defense Department said. His brother Ali was a person of interest in the Benghazi attacks and was killed by an airstrike in Iraq the day before.

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