The incident took place in village Berkhedi under Banda tehsil of the district.
The Class 6 girl was abducted two days back when she was returning home after appearing in her school examination, the police said.
Later, her parents filed a missing person's complaint with the police.
"It is a case of kidnapping and murder in a cruel manner and we are probing it from all angles," Singh said.
During questioning, her uncle said they had a land dispute with a neighbour, Chotelal Patel, whom he suspected to be involved in the crime, the ASP said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)