Suresh, Nagaraj and Sridhar were arrested for making the call, which led to an extensive search of both the buildings, which turned out to be a hoax, they said.
"At about 12.30 PM, Suresh called the control room saying that by September 25, Nagaraj would plant a bomb in the Chief Minister's Office in VidhanaSoudha and Nehru Planetarium.
"We launched a hunt for the caller and arrested him along with hisaccomplices," said a police officer.
Police rushed a bomb disposal team and a dog squad to both places and concluded that it was a mischievous call when nothing was found.
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