At least nine people were killed when a bus and two other vehicles crashed into a ravine in a mountainous area of ??Costa Rica, the Red Cross reported on Sunday.

The tragedy was sparked when heavy rain on Saturday afternoon triggered a landslide on a mountain pass called El Hundimiento in Cambroner in Alajuela province, about 80 kilometers west of the capital San Jose.

“So far we have found nine people who had no vital signs,” the Red Cross said on Twitter after the accident.

Another 34 people were rescued alive and 11 remain injured and trapped in the bus in the 75-meter (245-foot) gorge.

The fire brigade and other emergency services began rescue operations on Saturday evening. The authorities suspect that there could be other victims under the double-decker bus, which was carrying around 60 people.