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The US Treasury announced sanctions Wednesday on a rebel loyal to eastern strongman which is allegedly behind multiple murders, kidnapping and torture.

The Treasury said Mohamed Al-Kani and the Kaniyat militia are "responsible for the murder of civilians recently discovered in numerous mass graves in Tarhuna."

Libyan government forces discovered 11 mass graves in June around Tarhuna, southeast of Tripoli.

Tarhuna was the main staging point for Haftar's abortive offensive aimed at seizing the capital from the UN-recognized Government of National Accord.

On November 7, the government's missing persons authority said it had unearthed 17 bodies from a newly-discovered mass grave near the town.

Government forces have blamed Al-Kani's militia, and have said that victims showed signs of being tortured and burned, and some buried alive, according to the Treasury. 

"Mohamed al-Kani and the Kaniyat militia have tortured and killed civilians during a cruel campaign of oppression in Libya," Treasury Secretary Steven Mnuchin said in a statement.

The sanctions seek to freeze any property of those named under US jurisdiction and to block their access to the world trade and banking system.

Agencies contributed to this report.