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A fighter jet crashed into a stadium in a city in northwest , the country’s state-run news agency reported Monday. The crash killed two pilots and a civilian.

IRNA said the F-5 fighter crashed into a in a residential area of , a city of 1.6 million residents. Authorities are investigating the incident, the report said.

Gen. Reza Yousefi, commander of the air base in Tabriz, said the crashed jet had been used for training and suffered a technical problem on its final flight.

“Pilots could not reach the runway,” he said, according to the report.

In an effort to avoid crashing into the residential area, the pilots guided the jet to the stadium, he said. The report quoted Yousefi as saying, “Pilots sacrificed themselves, they could (have) used the ejection system, but they refused to do it.”

Instead, they headed for the stadium “to keep people safe,” Yousefi said in the report.

Iran’s air force has an assortment of US-made military aircraft purchased before the 1979 Islamic Revolution. It also has -made MiG and Sukhoi planes. Decades of Western sanctions have made it hard to maintain the aging fleet.