Searches were also carried out at his official residence in Delhi, his two houses in Shimla and Rampur and a farm house in Mehrauli in South Delhi which is in the name of his son Vikramaditya Singh.
An 18-member CBI team swooped on the 81-year-old Chief Minister's residence in Shimla within minutes of his leaving with relatives for Sankat Mochan temple at 7.30 AM to solemnise marriage of his second daughter.
The CBI had registered a Preliminary Enquiry (PE) against Singh and his family members for allegedly amassing wealth of Rs 6.1 crore disproportionate to their known sources of income during the 2009-11 period while serving as Union Minister of Steel in the UPA regime.
The PE, which was recently converted into a regular case and the agency filed an FIR with a designated court here under the Prevention of Corruption Act, named Singh, his wife Pratibha Singh, LIC agent Anand Chauhan and Chunni Lal Chauhan.
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Terming the action as "highly vindictive", senior Congress leader Ghulam Nabi Azad said it is part of "Prime Minister Narendra Modi's hate agenda and political vendetta against Congress Party and its leaders (which) has reached its zenith today with CBI raids at the residence of India's senior most Chief Minister".
Azad told reporters said the action has set a "shocking example of politics stooping to its lowest ebb", as the CBI moved in at a time when his daughter was getting married.
"Modi government's lust for settling political rivalry has made it alien to India's culture and tradition of not disrupting marriage of a daughter. This inhumane, cruel and revengeful behaviour is characteristic of personal style of the Prime Minister," Azad, who is the leader of opposition in Rajya Sabha, said.