Three persons were critically injured when a bomb exploded at Katma village in Bihar's Madhubani district on Tuesday, a day before the fourth phase of Lok Sabha polling in the state.

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Shanti Devi was injured after the crude bomb, which she found lying on the ground, exploded in her hand.
Her husband and a neighbour's son, who were standing nearby, were also wounded in the explosion.
All of them have been admitted to a hospital.
Seven constituencies are going to polls on Wednesday in the fourth of the six-phase Lok Sabha elections in Bihar to decide the fate of 94 candidates.
All the seats are in the Kosi river belt - Madhubani, Jhanjharpur, Madhepura, Darbhanga, Samastipur (SC Reserved), Begusarai and Khagaria.
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