The US has indeed accidentally armed ISIS militants. A video uploaded by the militants appeared to show them rifling through grenades and other items from a supply drop intended for Kurdish fighters defending Kobani; the AP reports that the Pentagon has today confirmed ISIS got a bundle. Of the 28 supply bundles dropped on Monday, two were blown off course by wind. One was destroyed, the other grabbed by ISIS. It contained small arms, grenades, medical supplies, and ammunition, which a Pentagon rep says aren't substantial enough to give ISIS an advantage.
Fierce fighting continues around the besieged city, with ISIS launching fresh attacks on Monday, but Turkey has allowed Kurdish fighters from northern Iraq to cross its territory to join defenders. "Now we are no longer playing the defensive in this war. I believe the next couple of days will bring us victory," a Kurdish fighter tells the Guardian. "After the Americans provided us with weapons, we turned from defending the city to attacking ISIS." Also on Monday, ISIS fighters launched around 15 attacks on Kurdish fighters in northern Iraq, CNN reports. The near-simultaneous attacks, most of which were repelled, included a fresh assault on the Mosul Dam.