The party also demanded the resignation of the Chhattisgarh minister, "whose sex scandal Verma was investigating", and pitched for an independent probe into the entire episode.
"The Congress demands that Verma is released immediately and the entire episode is probed independently. We also demand the resignation of the Chhattisgarh minister," Congress leader Pawan Khera told reporters here.
He said Verma was arrested even though no FIR was lodged against him and added that the Chhattisgarh minister concerned too had not stated that the journalist blackmailed or threatened him through phone calls or text messages.
He accused the BJP governments at the Centre and in Chhattisgarh of attacking mediapersons "whenever they try to show the mirror" to those in power.
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Khera also criticised Prime Minister Narendra Modi for his "silence" when those who showed a mirror to the BJP governments were targeted.
"In 2005, BJP leader Sanjay Joshi had to resign after a CD surfaced. Modi (then the Gujarat chief minister) had put pressure then and Joshi had to resign from the BJP national executive. Modiji, will you also seek the resignation of the Chhattisgarh minister?," he asked.
The senior journalist, who had earlier worked with the BBC Hindi service and Amar Ujala, has claimed that the Chhattisgarh police is not happy with him as he is in possession of a "sex CD" involving a minister of that state.