At least 15 people were killed late Tuesday after debris from a massive landslide hit a bus in India’s northern state of Himachal Pradesh, local authorities said.

The bus was traveling on a hilly stretch near Bilaspur district when a landslide struck following days of torrential rains.

There were at least 20 to 25 passengers on the bus at the time.

Nine men, four women and two children were among those killed, police said.

Three injured children were rescued and admitted to a local hospital for treatment, according to a statement from the office of Sukhvinder Singh Sukhu, the state’s highest-elected official.

Rescue operations continued Wednesday trying to find other missing passengers who are believed to be dead, police said.

Intermittent rains have lashed the region since Monday, making the fragile mountain slopes unstable.