A huge tour bus fire killed at least one person Friday morning on the 60 Freeway, according to officials.

The incident happened around 5:38 a.m. in the area of State Route 60 and Azusa Avenue in Hacienda Heights, a California Highway Police incident log reported.

Police received a report of a bus fire on the freeway’s right shoulder with a fire on the rear of the bus.

The tour bus appeared to be associated with Viajes Azteca, a Mexican travel company. The California Post contacted a Pacoima location, and an employee was aware of the incident but could not confirm whether the bus was theirs and would not offer any details.

Around 6:50 a.m., officials discovered at least one person dead, and the incident was changed from a car fire to a fatality incident.

Images from the scene show the back half of the touring vehicle badly burnt out, as flames appeared to have engulfed several rows of seating.

The Los Angeles County Fire Department responded to the scene and has extinguished the blaze.

A SigAlert has been issued as the third and fourth lanes of the freeway have been closed, the incident log said.

Hacienda Heights is in eastern Los Angeles County.

Police have requested the Los Angeles County Coroner to visit the scene.

It’s unclear what started the fire. The bus did not appear to have been involved in a crash, and the luggage compartments on the bus were open.

This is a developing story, check back for updates.