Kejriwal, who had allegedly stayed at a KCF extremist's house in Punjab, was fanning terror forces through his actions, led by the dangerous mix of the AAP extreme left and extreme right ideologies, he said.
Amarinder said, "Pakistan's spy agency ISI was waiting for such opportunities, triggered by extremist violence in India, to strike at the nation."
"Fascist forces" like AAP and the Akali Dal, whose leader Parkash Singh Badal was to be blamed for the "increasing incidents of religious sacrilege" in the state, could go to any extent to "grab power", he said.
Amarinder said he had been repeatedly cautioning the Election Commission about entry of more than 40,000 outsiders, brought in by AAP from states like Bihar, Jharkhand and Uttar Pradesh, but the poll body failed to take any action.
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Replying to a question, he said blame for the incident went to Kejriwal, who had been encouraging fascism and even if AAP is not "directly involved" in the explosion, it was clearly promoting extremist ideology and forces.
"The AAP leader seemed not to realise the implications of such actions, the Punjab Congress president said, adding Kejriwal will soon discover that "if you play with fire you are also bound to get burnt."
He said, "Information revealed that two bombs had been planted in Maur to explode during the roadshow of the Congress candidate, but, fortunately, the second one did not go off."
He expressed his sympathies with the families of the victims.
Attacking Chief Minister Parkash Singh Badal for allegedly promoting fascism, Amarinder said he was responsible for the growing incidents of sacrilege in the state.
He alleged the Nabha jail break was also engineered by the Badals, who were trying desperately to "disrupt" the poll process as they are facing imminent defeat and wanted to spread fear among the electorate by letting loose armed gangs to pressurise the people into voting for the Akalis.