Updated 6:40 p.m. ET
VALLECITOS, N.M. A school bus carrying elementary school children rolled over Monday morning and the driver has died, investigators said. At least nine children were injured six of them seriously- in the crash in a mountainous area of northern New Mexico.
Officials say the driver, 69-year-old Pay Valdez, could have died from a possible heart attack, the crash or a combination of both, CBS Affiliate KRQE reports. He has not been identified.
New Mexico State Police said the Mesa Vista school bus rolled over on State Road 111 near Vallecitos in Carson National Forest.
Nine students from Ojo Caliente Elementary were injured, officials said. Investigators said the six injured students were taken to a nearby hospital for treatment and their conditions were unknown.
It was unclear if there were any other injuries or what caused the rollover.
The Rio Arriba Sheriff's Department and state police are at the scene north of Espanola.
Mesa Vista Consolidated School District is located in El Rito, N.M. and is around 120 miles north of Albuquerque.