US-led coalition forces have parachuted ammunition to  Syrian rebels fighting Islamic State jihadists, a US military spokesman said Monday.

"Coalition forces conducted an airdrop Sunday in northern Syria to resupply local counter-ISIL ground forces as they conduct operations against ISIL," a US Central Command spokesman Colonel Patrick Ryder said in a statement, using an alternative acronym for IS.

"The aircraft delivery included small arms ammunition to resupply counter-ISIL ground forces so that they can continue operations against ISIL."