The bus carrying students smashed into trees along the roadside of the Eskisehir-Bursa highway for an unknown reason, the agency reported, citing Ozdemir Cakacak, the province's governor.
All those wounded have been transported to three different hospitals, the news outlet added.
SON DAKİKA | 11 kişinin yaşamını yitirdiği tur otobüsü kazasında şoförler gözaltına alındı. https://t.co/OqUU01OlV7pic.twitter.com/8LdWdO1tee
The driver of the bus and his assistant have been taken into custody, while the investigation into the accident has already been launched, the media added.