At least six children were killed and 15 others injured after a school bus carrying 30 children overturned in Haryana’s Mahendergarh on Thursday morning, police said.

Police officials said the school bus belonging to GL Public School in Kanina met with an accident near Unhani village of the Mahendergarh district after the driver tried to overtake another vehicle. The school was functioning despite a holiday on the occasion of Eid-ul-Fitr.

“The injured students were rushed to various hospitals in Mahendergarh and Narnaul. The official documents show that the bus’s fitness certificate had expired six years ago in 2018,” said a senior police official.

Eyewitnesses alleged that the bus driver was drunk.

Haryana education minister Seema Trikha said she had spoken to the deputy commissioner and Mahendergarh superintendent of police to visit the hospital where the students are undergoing treatment and begin an investigation into the matter.