BAGHDAD (AP) -- Syrian warplanes bombed Sunni militants' positions inside Iraq, military officials confirmed Wednesday, deepening the concerns that the extremist insurgency that spans the two neighboring countries could morph into an even wider regional conflict. U.S. Secretary of State John Kerry warned against the threat and said other nations should stay out.
Meanwhile, a new insurgent artillery offensive against Christian villages in the north of Iraq sent thousands of Christians fleeing from their homes, seeking sanctuary in Kurdish-controlled territory, Associated Press reporters who witnessed the scene said.
The United States government and a senior Iraqi military official confirmed that Syrian warplanes bombed militants' positions Tuesday in and near the border crossing in the town of Qaim. Iraq's other neighbors -- Jordan, Kuwait, Saudi Arabia and Turkey -- were all bolstering flights just inside their airspace to monitor the situation, said the Iraqi official, who spoke on condition of anonymity because he was not authorized to speak to the media.
American officials said the target was the Islamic State of Iraq and the Levant, the Sunni extremist group that has seized large swathes of Iraq and seeks to carve out a purist Islamic enclave across both sides of the Syria-Iraq border.
"We've made it clear to everyone in the region that we don't need anything to take place that might exacerbate the sectarian divisions that are already at a heightened level of tension," Kerry said, speaking in Brussels at a meeting of diplomats from NATO nations. "It's already important that nothing take place that contributes to the extremism or could act as a flash point with respect to the sectarian divide."
Meanwhile, two U.S. officials said Iran has been flying surveillance drones in Iraq, controlling them from an airfield in Baghdad. The officials, who spoke on condition of anonymity because they weren't authorized to discuss the issue publicly, said they believe the drones are surveillance aircraft only, but they could not rule out that they may be armed.
A top Iraqi intelligence official said Iran was secretly supplying the Iraqi security forces with weapons, including rockets, heavy machine guns and multiple rocket launchers. "Iraq is in a grave crisis and the sword is on its neck, so is it even conceivable that we turn down the hand outstretched to us?" said the official, who spoke on condition of anonymity because of the sensitivity of the subject.
The intelligence-gathering and arms supplies come on the heels of a visit to Baghdad this month by one of Iran's most powerful generals, Qassem Soleimani, commander of the Revolutionary Guard's Quds Force, to help bolster the defenses of the Iraqi military and the Shiite militias that he has armed and trained.
The involvement of Syria and Iran in Iraq suggests a growing cooperation among the three Shiite-led governments in response to the raging Sunni insurgency. And in an unusual twist, the U.S., Iran and Syria now find themselves with an overlapping interest in stabilizing Iraq's government.
None-Arab and mostly Shiite, Iran has been playing the role of guarantor of Shiites in Iraq, Syria and Lebanon. It has maintained close ties with successive Shiite-led governments since the 2003 ouster of Saddam Hussein, a Sunni who oppressed the Shiites, and is also the main backer of Syria's Assad, a follower of Shiism's Alawite sect.
In a reflection of how intertwined the Syria and Iraq conflicts have become, thousands of Shiite Iraqi militiamen helping President Bashar Assad crush the Sunni-led uprising against him are returning home, putting a strain on the overstretched Syrian military as it struggles to retain territory recaptured in recent months from rebels.
Anthony Cordesman, a prominent foreign policy analyst at the Washington-based Center for Strategic and International Studies, said that with Syria's apparent willingness to now take on the Islamic State directly, "the real problem is how will Iran, the Iraqi Shiites and the Alawites in Syria coordinate their overall pressure on the Sunni forces?"
Qaim, where the Syrian airstrikes took place Tuesday, is located in vast and mostly Sunni Anbar province. Its provincial government spokesman, Dhari al-Rishawi, said 17 people were killed in an air raid there.
Reports that the Sunni militants have captured advanced weapons, tanks and Humvees from the Iraq military that have made their way into Syria, and that fighters are crossing freely from one side to the other have alarmed the Syrian government, which fears the developments could shift the balance of power in the largely stalemated fight between Assad's forces and the Sunni rebels fighting to topple him.