Sonia Gandhi collected leaders at the party headquarters early in the morning and led a march to Singh's residence about half a km away in the heart of the capital in which several of Singh's cabinet colleagues P Chidambaram, Anand Sharma, Ambika Soni and Veerappa Moily were present.

The Congress leaders also attacked the government accusing it of maintaining a "studied silence" after the CBI had told the court that there was no criminality involved in the allocation of Talabira coal blocks II to Hindalco company of Aditya Birla group in Odisha in 2005 when Singh also held the portfolio of coal. Gandhi declared that they would fight the case with all legal means at their command

"I was outraged at the news that summons had been served to Manmohan Singh," the Congress President said.

"The former Prime Minister is known not only in our country but throughout the world as being a person of integrity and probity. We are here to offer our unstinted support, our solidarity.

Also Read: Coal scam: Manmohan Singh, KM Birla, four others summoned as accused

"The Congress party is fully behind him. We shall fight this legally and with all our means at our command. We are sure, we are convinced that he will be vindicated," she told reporters at Singh's residence.

Singh, accompanied by his wife, received the leaders at the porch of his residence. The leaders greeted him warmly.      

The former Prime Minister had on Wednesday expressed confidence that he will prove his innocence in a fair trial.

Read More: Coal scam: I am upset, will prove my innocence, says Manmohan Singh on Court summons

"Of course, I am upset but this is part of life. I have always said I am open for legal scrutiny...I am sure the truth will prevail and I will get a chance to put forward my case with all the facts," Singh had said.       

A special court had summoned Singh along with industrialist Kumar Mangalam Birla, ex-coal secretary P C Parakh and three others as accused in a case pertaining to allocation of Talabira-II coal block in Odisha in 2005 and asked them to appear before it on April 8.

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