WASHINGTON - The Islamic State group’s finance chief has been confirmed killed in a coalition air strike last month, US officials said Thursday.

Abu Saleh was killed in late November, US military spokesman Colonel Steve Warren said in a videoconference from Baghdad, calling him “one of the most senior and experienced members” of the group’s financial network.

The US government’s envoy for the anti-IS fight, Brett McGurk, said on Twitter that Abu Saleh was killed along with two associates “as part of coalition campaign to destroy ISIL’s financial infrastructure,” describing him as the group’s “finance minister.” Moreover, Islamic State militants have looted up to $1 billion from bank vaults in Syria and Iraq and has made at least another half a billion dollars from black market oil sales, senior U.S. Treasury official Adam Szubin said on Thursday.

“ISIL has made more than $500 million from black market oil sales,” Szubin said in remarks prepared for delivery.

“It has looted between $500 million and $1 billion from bank vaults captured in Iraq and Syria,” Szubin said. “And it has extorted many millions more from the populations under its control, often through brutal means.”