The Congress party on Tuesday took strong objection to a 'slanderous' advertisement on some television channels raising its chief Sonia Gandhi's foreign origin without naming her.

The party requested the Election Commission to take immediate action in the matter, which was 'violative of the Model Code of Conduct'.

Party spokesman Kapil Sibal told reporters the advertisement purportedly issued by one Kamakshi Educational Society seeks 'to incite violence and is also against good taste and decency and was a case fit for prosecution'.

He accused the BJP of indulging in such tactics as its electoral graph was coming down day by day. "They (BJP) had collaborated with the British during the freedom struggle and now they are accusing Sonia Gandhi as a foreigner," he said.

Sibal wanted Aaj Tak and Zee TV channels, which are showing the ads as also cable operators telecasting these channels, to refrain from doing so as the 'ad was violative of the advertisement code' and its telecast could land those concerned in jail.

All India Congress Committee general Secretary Oscar Fernandes has already written a letter to Election Commission in the matter.