The cache of weapons included hand grenades, ammunition and rocket-propelled grenade launchers, according to a video uploaded by a media group loyal to the Islamic State group.
The video appeared authentic and corresponded to The Associated Press' reporting of the event.
The Britain-based Syrian Observatory for Human Rights, which bases its information on a network of activists on the ground, said the militants had seized at least one cache.
The militant group has been trying to seize the town for over a month now, causing the exodus of some 200,000 people from the area into Turkey. While Kurds are battling on the ground, a US-led coalition is also targeting the militants from the air.
Today, IS loyalists on social media posted sarcastic thank you notes to the United States, including one image that said "Team USA."
But the lost weapons drop was more an embarrassment than a great strategic loss.
Today, the US Central Command said U.S. Military forces conducted four airstrikes near Kobani that destroyed IS fighting positions, an IS building and a large IS unit.
Also today, Syrian government airstrikes hit a rebel-held town along the country's southern border with Jordan, killing at least eight people.
Activists with the Local Coordination Committees and the Observatory said the number of those killed was likely to rise as there are more victims under the rubble.
The airstrikes are part of battles between Syrian government forces and Islamic rebel groups for control of the area.
Syrian government forces have been heavily bombing rebel areas in recent weeks, while the US-led coalition has been conducting airstrikes against Islamic State militants elsewhere in Syria.
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