Officials said the searches were conducted at about seven locations in the Maharashtra capital, including premises of Siddique, a real estate firm and a builder connected to him.
Siddique, a former minister in Maharashtra government, is known for his links with Bollywood celebrities and got superstars Salman Khan and Shah Rukh Khan into a much talked about patch-up hug in 2013, after years of reported frosty relations.
Some front companies allegedly "connected to" Siddique were also searched by the Enforcement Directorate (ED) teams, which swooped down of these premises early morning.
The Bandra police had registered an FIR in 2014, on directions of a local court, to probe alleged financial irregularities in a slum rehabilitation project launched in suburban Bandra here, to which Siddique is alleged to have been involved.
More From This Section
Siddique has been the Chairman of the Mumbai board of the Maharashtra Housing and Area Development Authority (MHADA) between 2000-2004.
A complainant had approached a local court in 2012 stating that the flats allotted in the residential buildings constructed after demolishing the slum in the Bandra area were granted on the basis of alleged fake documents and had other irregularities.
The ex-minister had denied allegations made against him in this case in the past.
Siddique has been a three-time Congress MLA, Minister of State for food and Civil Supplies (during 2004-08) in the Maharashtra government and has also served as a Municipal Corporator.
His grand Iftaar parties are attended by a host of Bollywood celebrities. His 2013 party is remembered for actors Salman Khan and Shah Rukh Khan embracing each other, hinting a thaw in their ties.