The developments came on a day when Singh's daughter was getting married. The searches started at around 7.55 in the morning soon after Singh had left his residence in Shimla for the wedding function, sources in Shimla said.

The agency has been carrying out an inquiry against Singh and his family members for allegedly amassing wealth of Rs 6.1 crore disproportionate to the known sources of income while serving as Union Minister of Steel. Sources stated the preliminary inquiry against Singh, and others regarding alleged possession of disproportionate assets has been converted into a Regular Case under the Prevention of Corruption Act.

The CBI sources said the preliminary inquiry was against Singh, his wife Pratibha Singh, son Vikramaditya Singh, daughter Aparajita Singh and an LIC agent Anand Chauhan. The sources mentioned it is alleged that he got an unexplained income of Rs 6.1 crore during the period 2009-11 when he was serving as the Minister of Steel in the UPA government.

They said it is alleged that Singh while serving as the Union Minister invested Rs 6.1 crore in life insurance policies in his and his family members' name through LIC agent Chauhan.

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