The accused hurled the grenade at the residence of Akoijam Brojen, a head constable of Manipur police, at Singjamei Mayeng Leikai.
A child and four women were injured in the explosion which occurred at around 6.25 PM, police said, adding they are all out of danger.
However, their identity was yet to be established.
Local people captured the accused and beat him up injuring him seriously. He was also hospitalised.
His motive was not yet known, police said.
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