"Yesterday we announced that one re-supply bundle went astray and was destroyed. We have since re-looked at that and we have determined that a second bundle also went astray and probably fell into enemy hands," Pentagon Spokesperson Army Colonel Steve Warren told reporters during an off-camera news conference.
"One bundle worth of equipment is not enough equipment to give the enemy any type of advantage at all," Warren said.
"It's a relatively small amount of supplies. This is stuff ISIL already has," he said.
The supplies were provided by Kurdish authorities in Iraq and intended to enable continued resistance against ISIL's attempts to overtake Kobani.
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The State Department, however, refuted the ISIS claims that it seized American weapons.
"A second re-supply bundle was not recovered and may have been seized by ISIL. It is therefore possible that the video yesterday could be that of the missing bundle. The allegations, though, that were made that they were America- made weapons here that were recovered is not true because we did not drop any American-made weapons," State Department Deputy Spokesperson Marie Harf told reporters.
"This is a small amount of risk. In this case obviously this is a very small amount that may have fallen into the hands of someone else, but we believe that the over-riding national security imperative to take the step is important enough," she said.