CBI teams swooped down on the residences of former media barons Indrani Mukherjea and Peter Mukherjea in Mumbai and Goa, besides two residences of Sanjeev Khanna in Kolkata. The sleuths also searched Indrani's driver Shyamvar Rai's houses in Mumbai and Chhindwara, Madhya Pradesh, agency sources said.
They said the ancestral home of Indrani in Guwahati was also searched.
The sources said agency is looking for some specific corroborative material, which cannot be revealed at this stage, on the basis of inputs received during the questioning of Indrani, Sanjeev, Peter and Rai.
Indrani, Khanna and Rai have been arrested on the charge of murdering Sheena and disposing of her body in a forest in Raigad near Mumbai in April 2012.
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25-year-old Sheena, Indrani's daughter from her first marriage, was murdered on 24 April, 2012, and her body was burnt and disposed of the next day.
The Mumbai police had exhumed remains of a body from Raigad forest and later claimed that digital superimposition of the profile of Sheena had matched with the skull recovered from the forest.
The agency, which recently took over the investigation from Mumbai police, has filed a case under various sections of the Indian Penal Code including those related to criminal conspiracy, murder, abduction, destruction of evidence, causing hurt by giving poison and under the Arms Act.
The decision to handover the probe to CBI came after days of uncertainty on the supervisory role of former Mumbai Police chief Rakesh Maria, who was shunted out in the midst of the inquiry that he had proactively helmed.