"There were several theories floating regarding the reasons behind the attack," including a theory over the blast being a "retaliatory attack" or perhaps a "dress rehearsal" for a larger one of greater intensity, he said.
"If it was a rehearsal then Bangalore should brace itself for larger attack which needs to be foiled and this could be done only through thorough investigation," Yechury, who visited the sites of the yesterday's blasts, tolds reporters here.
He said that these incidents should not be politicised and condmened the attack.
"There should be a united common resolve to tackle the issue", he said. The centre should render all support to the state on the matter and all the agencies, including the central agencies, should work in cooperation to nab the culprits.
"There should be no communalising or branding of the issue, what is required is an impartial inquiry", he said adding terrorism was beyond regional, religion or linguistic divide.
He said that questions like lapse in intelligence failure or the state government not heeding to warnings could be settled later, right now the focus should be on tracking the culprits. He also cautioned that speculations should not deflect actual investigations.
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Remaining vigilant was the need of the hour, he said while lauding the people of the city for failing to fall a prey to provocation, which was the main aim of anti-national forces, seeking to create disunity and anarchy.