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NATO Secretary-General Anders Fogh Rasmussen said the alliance condemned the Syrian attack “in the strongest terms” and expressed solidarity with Turkey but did not speak of any possible armed action against Syria.

“It’s my clear expectation that the situation won’t continue to escalate,” Fogh Rasmussen told reporters after Tuesday’s meeting. “What we have seen is a completely unacceptable act and I would expect Syria to take all necessary steps to avoid such events in the future.”

Syria says the aircraft violated its airspace. But Turkey disagrees. According to Turkish officials, the plane had unintentionally strayed into Syrian airspace, but it was inside international airspace when it was brought down.

The jet’s two missing crew members have not been found.

Turkey said Tuesday its military will respond to any future violation of its border by Syrian military elements. Prime Minister Recep Tayyip Erdogan said that Turkish Armed Forces “will respond to all violations on the Syrian border.”

He said Syrian helicopters have violated Turkish airspace five times recently, without Turkish response.

Also Tuesday, Syria‘s state-run news agency said Syrian troops killed 10 “terrorists” in the Damascus suburb of Douma Monday night. The Syrian government refers to rebels as terrorists.