The designations announced on Wednesday ban anyone from providing support or resources to the operative, Usamah Amin al-Shibabi, or the militant group called al-Mulathamun Battalion. The designations also freeze property and assets that the designees have in the United States.
The militant group, which threatens to fight against Western interests, became a separate organization in late 2012 after its leader split with al-Qaida.
Al-Shihabi is an associate of Fatah al-Islam, a Lebanese group that has called for the destruction of Israel.
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