The children were sitting along side the wall for their mid day meal when the road roller, involved in road construction work outside, hit it (wall) leading to its collapse, police said.
The three children, identified as Jhanvi (7), Vandana (11) and Ritli (9), were buried under the debris and died, police said, adding 12 others were seriously injured and admitted to a local hospital where the condition of one of them was stated to be critical.