US planes pounded Islamic State positions in Syria for a second day later yesterday, but the strikes did not halt the fighters’ advance in a Kurdish area where fleeing refugees told of villages burnt and captives beheaded.

President Barack Obama, speaking at the United Nations, asked the world to join together to fight the militants and vowed to keep up military pressure against them

Those air strikes are not important, we need soldiers on the ground

“The only language understood by killers like this is the language of force, so the United States of America will work with a broad coalition to dismantle this network of death,” Obama said in a 40-minute speech to the UN General Assembly.

Syrian Kurds said Islamic State had responded to US attacks by intensifying its assault near the Turkish border in northern Syria, where 140,000 civilians have fled in recent days in the fastest exodus of the three-year civil war.

Washington and Arab allies have killed scores of Islamic State fighters in the first 24 hours of air strikes, the first direct US foray into Syria two weeks after Obama pledged to hit the group on both sides of the Iraq-Syria border.

“Those air strikes are not important. We need soldiers on the ground,” said Hamed, a refugee who fled into Turkey from the Islamic State advance.

Mazlum Bergaden, a teacher from Kobani who crossed the border yesterday with his family, said two of his brothers had been taken captive by Islamic State fighters.

“The situation is very bad. After they kill people, they are burning the villages.... When they capture any village, they behead one person to make everyone else afraid,” he said. “They are trying to eradicate our culture, purge our nation.”

Fighting between Islamic State militants and Kurds could be seen from across the border in Turkey, where the sounds of sporadic artillery and gunfire echoed around the hills.

The initial days of US strikes suggest one aim is to hamper Islamic State’s ability to operate across the Iraqi-Syrian frontier. yesterday US-led forces hit at least 13 targets in and around Albu Kamal, one of the main border crossings between Iraq and Syria, after striking 22 targets there on Tuesday, said the Syrian Observatory for Human Rights, a body which monitors the conflict in Syria.

The US military confirmed it had struck inside Syria northwest of al Qaim, the Iraqi town at the Albu Kamal border crossing. It also struck inside Iraq west of Baghdad and near the Iraqi Kurdish capital Erbil on Wednesday.

An Islamist fighter in the Albu Kamal area reached by phone said there had been at least nine strikes on Wednesday by “crusader forces”. Targets included in an industrial area.

Perched on the main Euphrates River valley highway, Albu Kamal controls the route from Islamic State’s de facto capital Raqqa in Syria to the frontlines in western Iraq and down the Euphrates to the western and southern outskirts of Baghdad.

Islamic State’s ability to move fighters and weapons between Syria and Iraq has provided an important tactical advantage for the group in both countries: fighters sweeping in from Syria helped capture much of northern Iraq in June, and weapons they seized and sent back to Syria helped them in battle there.

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