The theme of the week in the Syria conflict—that airstrikes are of only limited use in the struggle to degrade and destroy the Islamic State terror group—is about to be underscored in terrible fashion in the besieged border town of Kobani, which is under sustained, and mainly unanswered, assault by as many as 9,000 ISIS terrorists armed with tanks and rocket launchers.

I just got off the phone with a desperate-sounding Kurdish intelligence official, Rooz Bahjat, who said he fears that Kobani could fall to ISIS within the next 24 hours. If it does, he predicts that ISIS will murder thousands in the city, which is crammed with refugees—Kurdish, Turkmen, Christian, and Arab—from other parts of the Syrian charnel house. As many as 50,000 civilians remain in the town, Bahjat said.

"A terrible slaughter is coming. If they take the city, we should expect to have 5,000 dead within 24 or 36 hours," he told me. "It will be worse than Sinjar," the site of a recent ISIS massacre that helped prompt President Obama to fight ISIS. There have been reports of airstrikes on ISIS vehicles, but so far, Bahjat said that these strikes have been modest in scope and notably ineffective.

Kobani is located on the Turkish border, but Bahjat said he is receiving reports that Turkey is pulling its troops back, rather than risk armed confrontation with ISIS. "It's unbelievable—Turkey is in NATO, so you literally have NATO watching what is happening in this town. Everyone can see it—the TV cameras are there, watching. It's terrible."