“According to the latest information I have, 17 people have been taken by ambulance to different hospitals in the region,” said Thomas Gustafsson, the duty officer in the county of Västmanland to the west of Stockholm.
“As far as I know now, no one was seriously injured,” he told AFP.
The bus had been taking the tourists from Finland to Copenhagen when it ran off the road near the town of Arboga and flipped over on its side.
The cause of the accident, which was reported to police shortly after 4:30pm (1430 GMT), had yet to be determined, Gustafsson said.
“The driver may have been going too fast or been blinded by the sun. We really don’t know. We’re trying to find out now exactly what happened,” he said.
Police said the driver was among those injured in the accident.