NATO leaders are to hammer out a response to Syria's shooting down of a Turkish military plane.
Washington has described the act as brazen and unacceptable, while Britain says the Assad regime will be held accountable.
Ankara insists the jet was downed in international airspace without warning, while Damascus maintains it was flying over Syrian territory.
Turkey has denied claims the plane was on a spying mission, saying it was on a training flight.
Syria responded that its actions were defensive and not aggressive.
Wreckage has already been located in the Mediterranean Sea, with the search for two missing pilots ongoing.
John Rees from the Stop the War Coalition, says the incident was most likely an error, that could yet turn into an international conflict.
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