No casualty was reported in the explosion, official sources said.
They said that the explosion was reported at around 8 AM as the march past began at Kangla in the heart of the capital complex.
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The co-ordination committee of six major insurgent outfits have given a boycott call for Republic Day celebrations over their claim that, "Manipur was forcibly merged with the Union of India".
Police sources said they have stepped up security and blocked all exit points to launch a combing operation in the capital complex. They said it was not yet clear whether the bomb was planted or hurled.
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