In Churanchandpur district, two women, aged 74 and 50, died after their houses collapsed during thunderstorm.
Another woman vendor was killed in Kakching district, when a tree fell on her shop, the official said.
At two different areas in Bishnupur district, at least ten children sustained injuries when they were on their way to school in the rain.
Several houses and market sheds were also damaged in the downpour across the state.
Meanwhile, Chief Electoral Officer PK Singh said he has apprised the Election Commission of the situation, seeking "immediate relief measures" for those affected in the thunderstorm and subsequent rain.
With the model code of conduct in place, Singh, however, cautioned the political parties against involvement in the relief work.
All measures will be taken up through official machinery, he added.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)