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By Mark Landler, Ben Hubbard and Helene Cooper • New York Times

WASHINGTON – President Obama on Tuesday hailed the U.S.-led coalition that conducted airstrikes against the Islamic State in Iraq and the Levant (ISIL) in Syria on Tuesday, declaring, "We're going to do what is necessary to take the fight to this terrorist group."

Speaking on the South Lawn of the White House, Obama said U.S. planes had also struck targets of another militant group, Khorasan, and declared that there would be "no safe haven" for the group, which officials say is linked to Al-Qaida and has been plotting attacks against Americans.

The United States already has bombed ISIL targets in Iraq at that country's request. But it did not seek permission to bomb the group in neighboring Syria.

The president emphasized that Saudi Arabia, Jordan, the United Arab Emirates, Qatar and Bahrain had taken part in the air operation.

"America is proud to stand shoulder to shoulder with these nations on behalf of our common security," he said. "The strength of this coalition makes clear to the world that this is not just America's fight alone." The fight, he said, "will take time."

Most of the strikes hit the extensive military and economic infrastructure of ISIL in northern and eastern Syria.

"In addition, the United States has initiated military actions in Syria against Al-Qaida elements in Syria known as the Khorasan group to address terrorist threats that they pose to the United States and our partners and allies," Obama said.

Reaction in Raqqa

In Raqqa, the Syrian city that is ISIL's de facto capital, the former governor's office used as a headquarters was reduced to rubble by the airstrikes. An equestrian club where fighters had lodged their families and a training camp near town also had been bombed.

Even after a year living under the fist of ISIL, where men with guns and a messianic vision controlled nearly every aspect of their lives, the people of Raqqa were surprised by what they found.

"I opened my shop at 8 a.m., and everything was ordinary," said shopkeeper Abu Khalil. "Then I heard from my neighbor that today's attacks were by the Americans, and not the regime."

The coalition hit training camps, headquarters and a recently captured air base. In Deir al-Zour province, along the border with Iraq, at least a dozen sites were hit, including an agricultural school turned into a command center.

At least one of the strikes killed civilians as well, raising suspicions of U.S. motives even among those who said they were otherwise happy to see ISIL pushed back.

"We know the history of American strikes in Afghanistan, Iraq and Yemen," said Ziad al-Ali, an unemployed university graduate in Raqqa. "When civilians are going to be killed, sorry is not enough."

Not a war on Islam

The participation of five Arab countries in the operation will bolster the president's argument that this campaign does not pit the United States against the Sunni Muslim world, but rather a broad coalition of Sunni Muslim and Western countries against a Sunni extremist group.

The air attacks were said to have scattered the jihadist forces and damaged facilities they have built in Syria that helped fuel their seizure of a large part of Iraq this year.

It was difficult to get a full picture on Tuesday of the toll taken by the airstrikes, in part because extremist groups in Syria generally do not report their casualties. It appeared that the great majority of those killed in the airstrikes were associated with ISIL or with the Nusra Front, the Al-Qaida affiliate in Syria.

At least 70 fighters from ISIL were killed in strikes in the north and east, according to the Syrian Observatory for Human Rights, an organization based in Britain that monitors the conflict in Syria. About 100 others were injured, the organization said.

Farther east, strikes on a group of villas abandoned by their owners killed about 50 people, the organization said, adding that most of the dead were foreign fighters.

The clearest reported case of civilian casualties came in the village of Kafi Daryan in Idlib Province, where 15 people were killed, about half of them civilians, including four children, the observatory said.

Witnesses in Syria, even those who oppose the airstrikes, acknowledged that they appeared to be precisely targeted, especially in comparison with the unguided bombs and exploding barrels regularly dropped by the Syrian government.

Separate from the attacks on ISIL, the U.S. Central Command said that U.S. forces acting alone "took action" against "a network of seasoned Al-Qaida veterans" from Khorasan in Syria to disrupt "imminent attack planning against the United States and Western interests."

Officials did not reveal where or when such attacks might take place.

Pentagon officials characterized the offensive in Syria as "very successful," and Rear Adm. John Kirby, the Pentagon press secretary, said that the strikes were "only the beginning" of a sustained campaign to destroy the Islamic State.

Airstrikes at midnight

Defense officials said the airstrikes began at midnight with the launching of some 40 Tomahawk cruise missiles from the destroyer USS Arleigh Burke at positions held in Aleppo by Khorasan. The majority of the cruise missile attacks were against Khorasan near Aleppo, but some were also launched at ISIL targets around the Sunni militant headquarters in Raqqa.

That first stage of the attack was conducted only by the United States. The second stage began soon after, and U.S. warplanes were joined by fighters and bombers from Saudi Arabia, the United Arab Emirates, Bahrain and Jordan, to target ISIL compounds, barracks and vehicles in northern Syria.

A third wave — which also included Arab countries — targeted ISIL positions in eastern Syria, Defense Department officials said. A senior military official said that during the three waves of strikes, the United States and its Arab allies dropped as many bombs in one night as the United States had during all of its previous operations against ISIL in Iraq.