A bomb blast occurred near primary health centre of Moreh town in Manipur, fourth such explosion in as many days in the same police station area, police said.
The explosion took place beside a road in Moreh police station in Tengnoupal district last night.
However, there was no casualty.
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Four police personnel had been injured in the attack.
Security measures were beefed up along Indo-Myanmar border following the blasts, police said.
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