A Syrian Kurdish refugee woman with her daughter waits for transportation after crossing into Turkey from the Syrian border town Kobane, near the southeastern Turkish town of Suruc in Sanliurfa province October 2, 2014. (Murad Sezer/Reuters)

As each shell fired into Kobane by the Islamic State boomed across the countryside Friday, the journalists positioned on a Turkish ridge nearby rushed to train their cameras on the puffs of smoke rising from the Kurdish town just across the border in Syria.

Turkish soldiers swung their heads to look. And the last residents fleeing what appeared to be the final assault on the town turned back to see what had been hit, and whether it might have been one of their homes.

The Islamic State advance on the obscure Kurdish town of Kobane has been watched by Turkish troops, monitored by spectators and broadcast live across the world by news channels since the militants launched their offensive two weeks ago. The town is so close to Turkey that the minarets of its mosques can clearly be seen from the Turkish side of the border, as can some of the movements of the approaching Islamic State fighters.

But in stark contrast to the response to the onslaught against Iraq’s minority Yazidis and Kurds in August, there has been no serious international effort to halt this Islamic State offensive against Kurds in Syria — neither from the Turkish forces deployed in strength around the area nor the U.S. warplanes now flying at will around northern Syria and regularly dropping bombs on Islamic State positions elsewhere.

For the Kurds of Kobane who have now mostly fled into Turkey, the big question is why the United States has not acted to save their town.

U.S. warplanes have struck in the vicinity of Kobane on up to four occasions since the offensive began — compared with more than 90 strikes carried out around Iraqi Kurdistan in the two weeks after President Obama ordered the U.S. military back into action in Iraq in June. The most recent U.S. attack was reported by Kurdish activists Friday night and could not be independently confirmed.

“If the Americans wanted to, they could finish Daash in one day,” said Hamida Mohammed, 30, using the Arabic acronym for the Islamic State. She was among the last trickle of refugees to flee the abandoned town as the Islamic State began its onslaught Friday.

“We don’t know why they don’t,” she added. “Nobody understands why.”

U.S. officials have struggled to answer the question. Kurdish activists on Twitter have widely disseminated CNN footage of Defense Secretary Chuck Hagel’s stumbling response to a question about the inaction of U.S. forces, in which he said the United States is talking to its “coalition partners” about ways to address Kobane.

“It’s not a matter of us not being aware of it nor not actively looking at the options we have to deal with it,” he said.

The real reason appears to be that the main focus of the U.S.-led air war remains on Iraq, with any strikes conducted in Syria intended primarily to degrade the Islamic State’s capacity to operate there, according to Andrew Tabler of the Washington Institute for Near East Policy.

“This is about stabilizing Iraq, not about minorities,” he said. “It appears Syria is secondary and strikes are not being carried out with a discernible political or humanitarian strategy.”

A Turkish soldier guards while Syrian refugees wait behind a barb wire barrier to be transferred to a camp after they crossed the border at the Yumurtalik gate near Sanliurfa, southeast of Turkey, 02 October 2014. (Sedat Suna/EPA)

U.S. officials asked to explain the inaction in Kobane cast the answer in similar, if less explicit, terms.

Rear Adm. John Kirby, the Pentagon spokesman, noted to reporters Friday that airstrikes had been conducted in the vicinity of the town, adding that if they could be conducted “in such a way that we’re not going to cause any greater damage or civilian casualties, then . . . we’re going to do it,” he said.

But, he added, “we’re broadly focused, not just on one city and one town. We have to stay broadly focused on the whole region.”

“The focus in Syria has really been about the safe haven they enjoy,” he said of Islamic State fighters. “In Iraq, it’s really been much more focused on supporting Iraqi security forces and Kurdish forces on the ground.”

More challenges in Syria

Syria also presents a far more complex set of challenges than Iraq, where the Iraqi government and the Kurdish regional authorities support the U.S. mission. The United States still has no viable partner in Syria, and State Department spokeswoman Jen Psaki said the U.S. government is focusing its efforts on working with Turkey to find a solution to the conflict on its border, including the possibility of finding a way to unite rival Kurdish and Syrian rebel factions to save Kobane.

But Turkey remains ambivalent about joining the coalition against the Islamic State, despite a vote in parliament Thursday authorizing military intervention. Turkey is anxious not to take any action that would embolden its Kurdish foes on either side of the border, and the resolution named the Kurdish Workers’ Party, or PKK — the parent organization of the Kurdish militia fighting in Kobane — as one of the targets of any future military intervention, along with the Islamic State and Syria’s President Bashar al-Assad.

Turkish Prime Minister Ahmet Davutoglu signaled late Thursday that Turkey might be prepared to act. “We wouldn’t want Kobane to fall. We’ll do whatever we can to prevent this from happening,” Davutoglu told Turkish journalists.

But it remains unclear what Turkey is prepared to do. Meanwhile, the Syrian government and Iran both warned Turkey on Friday that they would regard any intervention in Syria as an act of “aggression,” further complicating the situation.

Kurds say they are bracing to defend Kobane unaided. The Syrian Kurdish fighters with the YPG — or People’s Protection Unit — are confident they can hold out for days and perhaps weeks. They are motivated and united and, unlike the radical Islamist militants, they know the streets, said Ibrahim Kader, a Kobane activist now in Turkey.

But Turkish forces are preventing supplies from reaching the town and the Islamic State is surrounding the Kurds on three sides. A convoy of food dispatched last week by Iraqi Kurds will soon run out. A video posted online this week showed Kurdish fighters shooting at Islamic State tanks with ancient Kalashnikovs, held together with tape.

“If the YPG had tanks, we could defeat them, but we have no heavy weapons,” said Ahmed Mustafa, another of the refugees who left Friday. “So we are just praying for American airstrikes.”