In a letter to the EC, the Congress alleged that Modi took out the road show in Varanasi from BHU (Banaras Hindu University) "without the necessary permission from the competent authority".
"It is requested that action may be taken and FIR registered against all BJP leaders including Narendra Modi who were part of the road show," said K C Mittal, AICC secretary incharge of legal and human rights cell.
Mittal said the road show covers three assembly seats of Varanasi South, Varanasi Cantt and Varanasi North and Modi also visited the Kashi Vishwanath Temple and Kaal Bhairo Temple during the event.
"All this was done without any requisite permission for conducting the road show from the competent authority of the Election Commission," Mittal told PTI.
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On a whirlwind day in his Lok Sabha constituency to rally voters around the BJP in eastern Uttar Pradesh, Modi took out a road show, offered prayers at the two historic temples and paid tributes to Hindutva ideologue Madan Mohan Malviya today.
BJP leaders believe the event, broadcast live on most regional TV news channels, will help their cause when the 40 remaining seats go to polls in the final phase on March 8.
The seven-phase assembly polls in UP end on March 8 and results will be out on March 11.