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Boys ride a bicycle past other civilians near damaged buildings in the Damascus suburb of Harasta. Image Credit: REUTERS

Kabul The US has begun surveillance flights over Syria after President Barack Obama gave the OK, US officials said, a move that could pave the way for airstrikes against Islamic State of Iraq and the Levant (Isil) militant targets there.

While the White House says Obama has not approved military action inside Syria, additional intelligence on the militants would likely be necessary before he could take that step. Pentagon officials have been drafting potential options for the president, including airstrikes.

One official said the administration has a need for reliable intelligence from Syria and called the surveillance flights an important avenue for obtaining data.

Two US officials said Monday that Obama had approved the flights, while another US official said early Tuesday that they had begun. The officials were not authorized to discuss the matter by name, and spoke only on condition of anonymity.

Army Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, told reporters in Kabul, Afghanistan, on Tuesday that the US wants more clarity on the militants in Syria, but declined to comment on the surveillance flights.

“Clearly the picture we have of Isil on the Iraqi side is a more refined picture,” said Dempsey. “The existence and activities of ISIS on the Syrian side, we have ... some insights into that but we certainly want to have more insights into that as we craft a way forward.”

The US began launching strikes against Isil inside Iraq earlier this month, with Obama citing the threat to American personnel in the country and a humanitarian crisis in the north as his rationale. Top Pentagon officials have said the only way the threat from the militants can be fully eliminated is to go after the group inside neighboring Syria as well.

Obama has long resisted taking military action in Syria, a step that would plunge the US into a country ravaged by an intractable civil war. However, the president’s calculus appears to have shifted since Isil announced last week that it had murdered American journalist James Foley, who was held hostage in Syria. The group is also threatening to kill other US citizens being held by the extremists in Syria.

Dempsey, who was in Kabul for the US military’s change of command ceremony, has said he would recommend the military move against Isil militants if there is a threat to the homeland. He didn’t rule out strikes for any other critical reasons, but listed the homeland threat as one key trigger.

Dempsey also said the US has been meeting with allies in the region to help develop a better understanding of the Isil threat. He said he believes those talks are now beginning to “set the conditions for some kind of coalition to form.”

He said they are “trying to better understand the threat that Isil poses, not just in Iraq and Syria but regionally.” Dempsey has said he believes key allies in the region - including Jordan, Turkey and Saudi Arabia - will join the US in quashing Isil.

The US had already stepped up its air surveillance of Isil inside Iraq earlier this year as Obama began considering the prospect of airstrikes there. And the administration has run some surveillance missions over Syria, including ahead of an attempted mission to rescue Foley and other US hostages earlier this summer.

The US special forces who were sent into Syria to carry out the rescue mission did not find the hostages at the location where the military thought they were being held. Officials who confirmed the failed rescue last week said the US was continuing to seek out intelligence on the other hostages’ whereabouts.

Administration officials have said a concern for Obama in seeking to take out Isil inside Syria is the prospect that such a move could unintentionally help embattled Syrian President Bashar Al Assad. A top Syrian official said Monday any US airstrikes without consent from Syria would be considered an aggression.

Isil is among the groups seeking Al Assad’s ouster, along with rebel forces aided by the US.

The White House on Monday tried to tamp down the notion that action against Isil could bolster Al Assad, with Earnest saying, “We’re not interested in trying to help the Al Assad regime.” However, he acknowledged that “there are a lot of cross pressures here.”