Colorado authorities on Monday were investigating what caused a bus carrying a New Mexico high school church group home from a weekend retreat to veer off a highway and crash, killing the driver and a man training to become a Catholic priest.

Investigators were looking into the possibility the driver had a medical issue that may have contributed to the crash Sunday that also injured 13 people, State Patrol Sgt. Blake White said. The coroner will make that determination about the driver, whose identity had not been released late Monday.

Jason Paul Marshall, a 53-year-old seminarian with the Albuquerque-based Archdiocese of Santa Fe, also was killed, the archdiocese said in a statement. He chaperoned the youth group that had attended a Catholic retreat in Denver.

Emergency crews respond to a bus crash on southbound Interstate 25 in Pueblo County, Colo., Sunday afternoon, June 23, 2019. A charter bus carrying more than a dozen people ran off the highway after striking a bridge support Sunday in southern Colorado, killing a few people and injuring several others, a state patrol official said. (Zach Hillstrom/The Pueblo Chieftain via AP)
Emergency crews respond to a bus crash on southbound Interstate 25 in Pueblo County, Colo., Sunday afternoon, June 23, 2019. (Zach Hillstrom/The Pueblo Chieftain via AP)

White said four people remained hospitalized — one of them in critical condition. Nine passengers were treated for minor injuries and released, he said.

White said the bus operator, Follow the Sun Inc. of Albuquerque, was cooperating in the investigation. Telephone messages left with the company weren’t immediately returned.

The passengers belonged to the Roman Catholic parish based at the University of New Mexico. Church officials in New Mexico and Colorado say the group had attended a retreat for 2,500 young people from 12 states in Denver and were returning home when the bus struck a bridge abutment and veered off Interstate 25 north of Pueblo.

Emergency crews respond to a bus crash on southbound Interstate 25 in Pueblo County, Colo., Sunday afternoon, June 23, 2019. A charter bus carrying more than a dozen people ran off the highway after striking a bridge support Sunday in southern Colorado, killing a few people and injuring several others, a state patrol official said. (Zach Hillstrom/The Pueblo Chieftain via AP)
Emergency crews respond to a bus crash on southbound Interstate 25 in Pueblo County, Colo., Sunday afternoon, June 23, 2019. (Zach Hillstrom/The Pueblo Chieftain via AP)

Marshall, a native of Staten Island, New York, was a member of Our Lady of the Annunciation parish in Albuquerque and had attended the Pontifical College Josephinum in Columbus, Ohio, the Archdiocese of Santa Fe said.

“Jason was a splendid and exemplary seminarian, a humble man who deeply cared for others,” Archbishop John Wester said.

The Archdiocese of Santa Fe has scheduled a special mass Wednesday. The Denver archdiocese issued a statement Monday offering prayers and condolences to the victims, their families and their friends.

Three medical helicopters and dozens of ambulances and fire crews responded to the crash. There were extensive traffic backups in both directions as authorities extricated victims from the bus and treated the injured.

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