Syrian activists say that one of the U.S. airdrops with weapons and ammunition meant for Kurdish fighters near the town of Kobani has instead landed in the hands of Islamic State militants.The British-based Syrian Observatory for Human Rights, with sources inside Syria, said Tuesday that the sizable parachuted cache was grabbed by the insurgents after the U.S. Air Force dropped the supplies Sunday night. The rights group said the jihadists also may have secured a second consignment intended for the Kurdish militiamen, who are fighting for control of the town just south of the Turkish border.The United States has acknowledged that one of its airdrops landed in the wrong spot and destroyed it when the error was discovered, but says that the "vast majority" of the 27 airdrops ended up in the hands of the Kurdish fighters.A video uploaded by a media group loyal to the Islamic State shows a masked fighter inspecting the cache of hand grenades, ammunition and rocket-propelled grenade launchers. The fighter voiced his delight at capturing the arms cache."Thanks be to God, spoils and booty for the mujahedeen," he said.Analysts tell the Associated Press the poorly aimed weapons drop may be a mistake of little strategic consequence. The Islamic State already possesses a huge trove of American weapons seized from Iraqi soldiers as they fled in the face of the militants' takeover of vast reaches ofIraq.With the fight for Kobani unresolved, Britain says it will soon conduct military surveillance flights over Syria to collect intelligence on Islamic State militants.