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Washington • U.S. cargo planes dropped small-arms ammunition to Arab groups fighting the Islamic State (IS) in northern Syria, a U.S. military spokesman said Monday.

Col. Steve Warren, a spokesman in Baghdad for the U.S. military command in charge of the anti-IS campaign in Syria and Iraq, said by email that the airdrop was conducted Sunday by Air Force C-17 cargo planes. He did not identify the Arab groups that received the supplies but said their leaders had been vetted and have been fighting to remove IS from northern Syria.

The airdrop is in line with a revamped U.S. approach in Syria. The Obama administration announced last week that instead of trying to build a new Syrian rebel force, it will provide equipment, including ammunition, to existing Syria rebel groups who share the U.S. goal of defeating IS.

Separately, a Kurdish official in the northern Syrian city of Kobani said the U.S. had provided 120 tons of weapons and ammunition to the main Kurdish militia — the People's Protection Units or YPG — fighting the Islamic State in that area. The official, Mustafa Bali, said he did not know whether the supplies had been provided by air or land.

The U.S. military headquarters in charge of the coalition campaign against IS said in an email to The Associated Press that it had made no delivery of weapons or ammunition directly to the Syrian Kurds in the past week.

Spokesmen for the YPG did not return calls.