He added: "I wish Allah's mercy on our citizens who have lost their lives and a speedy recovery to the injured", he said.
Passengers on the bus were mainly families with their children travelling to Bursa to spend the upcoming half-term at the popular Uludag ski resort nearby.
"The bus, which was carrying students on a trip from Ankara to Bursa, for some unknown reason, crashed into trees growing near the highway".
Three different hospitals have received all wounded people, the news outlet added.
WWE Suspends Cruiserweight Champion Enzo Amore After Rape Accusation Surfaces
I remember bits &pieces & I have constant flashbacks.My mental issues have been the worst ever & i suffer from major PTSD from it. We are simply reporting the alleged details as they were told by the accuser themselves.
Those injured were now being treated at three different hospitals, he added, but it is not known if there are any children among the victims.
The road was empty and had no hazardous conditions, the official said, vowing that the causes would be made clear.
Two bus drivers have been arrested in connection with the case, BBC reported.
Last year, 7,300 people died in over 1 million accidents on Turkish roads, according to the Turkish statistical institute.