School bus collides with train in India: 4 pupils dead

"There were 40 children in the bus. Of them, four are dead and 21 others are hospitalised," said Sidh Nath Gupta, police chief at Jalpaiguri, 600km north of Kolkata.

The seriousness of the 21 children's injuries was not immediately known.

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Leena Sharma, spokeswoman for the Northern Frontier Railway, said the bus driver appeared to be at fault, rushing onto the path of the train.

Sharma gave a toll of 30 children injured in the accident, which occurred at an unstaffed railway crossing near Jalpaiguri at about 10:45 am (0515 GMT).