At least 21 people have been killed after a bus packed with students overturned in southwestern Iran, according to the country's state radio.
The driver lost control because the vehicle was going at high speed in wet conditions, senior police official Colonel Mohammad Reza Mehmandar was quoted as saying.
Some 23 other people were hurt in the accident and have been taken to hospital for treatment.
The crash happened on the Izeh-Lordegan road, about 300 miles southwest of the capital Tehran.
Iran has one of the worst road safety records in the world, with more than 400,000 accidents and about 20,000 deaths every year.
The high death tolls are blamed on high speed, unsafe vehicles, widespread disregard of traffic laws and inadequate emergency services.