At least 13 students from multiple countries died along a highway in northern Spain on Sunday when their bus crashed into a guardrail before slamming into oncoming traffic and landing on its side near the town of Freginals, according to a local official.

The accident smashed out the front windows of the red, white and black bus, injuring at least 34 people, most of whom were taken to local hospitals.

Students from 19 countries were reportedly among 61 passengers that included many Spanish nationals, according to Reuters. Eight people were seriously wounded.

Most of the individuals traveling on the bus were affiliated with two European universities through the European Union’s Erasmus exchange program, officials said.

Passengers were returning from a fireworks festival when the accident took place.

Firemen stands next to the wreckage of a bus after a traffic accident in Freginals, Spain, March 20, 2016. REUTERS/Albert Gea – RTSBB86

Regional government spokesman Jordi Jane told the Associated Press in a statement that the government was contacting officials from “Hungary, Germany, Sweden, Norway, Switzerland, Czech Republic, New Zealand, United Kingdom, Italy, Peru, Bulgaria, Poland, Ireland, Palestine, Japan and Ukraine.”

One Spanish official said that all of the dead were women between the ages of 22 and 29.

“There were students on board, many of them foreign students studying in Catalonia and in Barcelona who had traveled to Valencia for the Fallas and were returning,” Jane told reporters.

Officials have not released the cause of the accident.

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