The BJP, however, defended its action, saying there was "nothing wrong in it".
The BJP advertisement questioning the "silence" of Chief Minister Nitish Kumar over "repeated insult" to "revered" cow by his "friends" everyday appeared in vernacular newspapers in Kishanganj, Saharsa and other areas that will go to poll in in the fifth and final round of assembly election tomorrow.
The advertisement quoted Lalu Prasad's "Hindus also eat beef" remark and Singh's comment that "it is written in Vedas and Puranas that saints used to eat beef in ancient times."
It also quoted Karnataka CM Siddaramaiah's comment that "if I want to eat beef nobody can stop me."
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Reacting angrily to the advertisement, the grand alliance today approached the Election Commission seeking action against the BJP for trying to "polarize Bihar elections by promoting communal hatred".
A delegation comprising JD(U) general secretary K C Tyagi and Congress spokespersons RPN Singh and Ajoy Kumar today met the EC and alleged the advertisement amounted to "seeking votes in the name of religion".
The BJP, however, defended its action with senior party leader Sushil Kumar Modi saying,"There is nothing wrong in our advertisement on beef issue and asking the chief minister to break his silence on controversial remarks made by the RJD supremo Lalu Prasad, his colleague Raghuvansh Prasad Singh and Karnataka Chief Minister S Siddaramaiah."