Speaking to a Kannada TV news channel, Shivakumar's mother Gowramma had accused Siddaramaiah of "betraying" her son.
Ahmed Patel, a political secretary to Congress chief Sonia Gandhi, is locked in a bitter fight in the election.
Unaccounted wealth is now in the banking system thanks to demonetisation. Publicly available data shows how different routes were used to bring the money in
The engineering and construction company says income tax authorities are carrying out search proceedings at its premises on December 16 and December 17, 2015.