The move came after the state home department decided that the probe would not be entrusted to CBI and investigations would be carried out by the State Vigilance and Anti-Corruption Bureau.
Sources in the Vigilance Bureau said that a Special Investigation Team (SIT) is being set up to expedite the preliminary probe and the bureau has already got some inputs in this regard.
Chief Minister Virbhadra Singh had yesterday made some remarks about the properties of Dhumal and his family and said that the probe would cover his both stints as chief minister.
In August, Dhumal had demanded a probe and action from Prime Minister Narendra Modi into the charge that he and his family amassed assets disproportionate to their known sources of income.
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In a letter, released to the media by opposition BJP, Dhumal said the Congress government had unleashed a maliciouscampaign against him and his family since it came to power in December 2012.
"Like on previous occasions, a list of assets allegedly owned by meand my family has been sent to the state additional director generalof vigilance. The complaint is without any affidavit," said the letter,dated August 7.
Asking the prime minister to secure an affidavit from the complainant, Dhumal said an inquiry either by a judge of the Supreme Court or bythe CBI should be conducted into the allegations.
Meanwhile, state BJP general secretary Randhir Sharma dubbed the decision of the government to order a vigilance probe against Dhumals as an act of vengeance and motivated by malicious intentions to tarnish his image.
"Chief minister had been repeatedly claiming that Dhumals owned properties outside the state and as such how the state vigilance agency could conduct probe in other states," he said, adding that the entire exercise is aimed at victimising the leader of the opposition and diverting the attention of the people.