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See also Wednesday's Iran Live Coverage: Tehran Continues to Push "Positive" Nuclear Talks
2032 GMT: Drone Watch. Pentagon officials have altered their story about the encounter between a Predator drone and an Iranian fighter jet (see 1848 GMT), over or near the Islamic Republic's airspace over the Persian Gulf.
"One of the US aircraft discharged a flare as a warning to the Iranian plane, which then broke off pursuit," spokesman George Little said.
Officials earlier suggested that two Iranian jets had "targeted" the Predator.