Iranian state TV says an air force Sukhoi-24 has crashed while on patrol near the southern city of Shiraz, and that the two pilots ejected and survived.
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The Sunday report did not say what caused the fighter jet crash, but said an investigation is underway.
Iran signed a contract with Moscow in February to purchase a newer version of the Russian-made fighter jet, the Sukhoi-30.
Iran's air force still relies largely on domestically modified versions of long-outdated warplanes, including Soviet MiGs and American F-14 Tomcats from the 1970s.