The development comes after the arrest of five people in connection with the brutal murder of the scribe.
Bihar Police ADGP Sunil Kumar had earlier said that the five men were engaged by contract killer Mian, known to be close to former RJD MP Mohammad Shahabuddin
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The Bihar Police had earlier said that initial investigations into the murder of Hindustan daily's Siwan bureau chief Ranjan, indicated at the possible involvement of jailed RJD leader Mohammed Shahabuddin.
The ADGP said that Ranjan was shot from point blank range.
Mian, who had been released from jail 15 days before Ranjan's murder, left Siwan with his family two hours after the crime, the top cop said.
Ranjan, a journalist with over 20 years of experience and the bureau chief of the Hindi daily Hindustan, was shot dead in Bihar's Siwan district.
Five shots were fired at him from extremely close range near Siwan's railway station.
Ranjan was rushed to the hospital where he was declared brought dead.