At least four school children, including a girl, were killed and 10 injured when the wall of an Anganwadi centre collapsed in Odisha's Nayagarh district today. Police said the incident took place at the Anganwadi centre operating in Nelia Upper Primary School campus at Suansia Sahi village under Ranpur police station area when children were in the class room. While three children identified died on the spot, another succumbed to her injury at the Capital Hospital in Bhubaneswar. Meanwhile, the state government announced Rs 1 lakh ex-gratia each for the family of the victims besides freetreatment for the injured students.