The children started complaining of stomach ache and vomiting after having 'chaat' from a vendor on Kiratpur- Akbarabad road after yesterday's Eid prayers, they said.
They were rushed to the hospital where condition of three was stated to be serious. The matter is being probed, Chief Medical Officer S K Agnihotri said.
The police said that the chaat being sold was stale due to which the children fell ill.
No one has been arrested so far.