The bus trips over the curbing behind us and rolls over onto its left side," said Trooper Mark Francis.
Troopers say 16 people were on the bus -- 12 high school boys, three coaches and a driver.
Nine of those on board were taken to Northwest
and Swedish Edmonds hospitals for treatment of injuries such as cuts, concussions and one had a broken arm, troopers said.
The others on board were reunited with their families at the scene, according to Francis
The bus, which is not equipped with seat belts, passed its last inspection in 2014, according to Francis
While the driver says the brakes went out, Francis
said investigators tested the brakes and found them to be functional.