Kenya’s defense chief and nine other top brass died on Thursday in a military helicopter crash in a remote area of the country, President William Ruto said. Two officers survived the crash, including the pilot.

“Today at 2:20 pm, our nation suffered a tragic air accident… I am deeply saddened to announce the passing of General Francis Omondi Ogolla,” Ruto told reporters.

The president, who had convened an urgent meeting of the National Security Council after news of the accident emerged, said nine other “gallant military personnel” on board were also killed while two survived.

He said the Kenya Air Force has dispatched an air investigation team to establish the cause of the crash, which took place in Elgeyo Marakwet county, about 250 miles northwest of the capital Nairobi.

The helicopter crashed shortly after takeoff from Chesegon, where he and his entourage had been visiting a school, Ruto said.

“A distinguished four-star general has fallen in the course of duty and in the service of the country,” he said. “Our motherland has lost one of her most valiant generals, gallant officers, service men and woman.”

Ruto announced three days of mourning from Friday, with official flags flying at half mast.

He said Ogolla, 61, had left Nairobi on Thursday morning on an air force Huey helicopter to visit troops deployed in the North Rift area in Operation Maliza Uhalifu (Operation End Crime in Swalihi), and other sites.