Washington, October 24 (RHC)-- The Pentagon says it is investigating evidence an airdrop of arms intended for Kurdish fighters has ended up in the hands of Islamic State militants.

Pentagon spokesperson John Kirby responded to a video posted on Youtube, which appears to show the militants with a cache of weapons. He said that the U.S. was "very confident" that the vast majority of the bundles of weapons and ammunition ended up "in the right hands."

Kirby said the United States had targeted the one bundle that went astray with an airstrike. The airdrops come as part of an effort to defend the Syrian town of Kobani.

The Barack Obama administration had previously said Kobani was not a part of its "strategic objective." But The Wall Street Journal reports the United States was actually working very closely with Syrian Kurdish commanders in secret to defend Kobani.