U.S. and coalition warplanes pounded ISIS positions in eastern Syria on Wednesday, targeting what a Pentagon official described as mobile oil refineries being used by the so-called Islamic State terror group to help finance its operations.

The latest round of airstrikes were aimed at cutting off money flowing to ISIS, which makes up to $2 million a day from oil produced by the mobile refineries, Navy Rear Adm. John Kirby, the Pentagon spokesman, told CNN.

Fighter jets from Saudi Arabia and the United Arab Emirates flew alongside U.S. aircraft during the operation, hitting 12 locations, Kirby said.

While the U.S. military was still assessing the outcome of the attacks, Kirby said initial indications suggest the strikes were successful.

"We are very confident we hit what we were aiming at, and we caused the damage we wanted," he said.

The airstrikes came just hours after U.S. President Barack Obama called for united action to confront ISIS, also referred to as ISIL.

"It is no exaggeration to say that humanity's future depends on us uniting against those who would divide us along fault lines of tribe or sect; race or religion," Obama said in an address before the U.N. General Assembly.

"This is not simply a matter of words. Collectively, we must take concrete steps to address the danger posed by religiously motivated fanatics, and the trends that fuel their recruitment."

China, Russia raise questions

Obama's call for action comes as questions were raised over his decision to bomb terror groups in Syria without approval from the U.N. Security Council.
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