The development came as the UP police today registered a murder case in the matter, five days after Anurag's body was found on his birthday under mysterious circumstances near a guest house, where he was staying, in the high-security Hazratganj area here.
"It has been decided to hand over the probe to the CBI," DGP Sulkhan Singh told a press briefing here. Hours earlier, the Karnataka-cadre officer's mother Sushila Devi and brother Mayank had met the CM to press for a CBI probe saying they were unhappy with the handling of the investigation by the UP police.
Mayank today alleged that the scene of crime had been washed and the officer's mobile phone was found in an unlocked condition. "We are not satisfied with the police probe. The chief minister has assured us that justice will be done," he said.
In his police complaint, Mayank said his brother was an "honest officer" and was transferred seven to eight times in his decade-long career. He also claimed that Anurag had told them that there was a threat to his life.
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Post-mortem examination had indicated that Anurag, 36, had died of asphyxia but police had said that an SIT team probing the case was awaiting the test reports of his viscera and blood samples and heart to find the exact cause of the death.
In the complaint to police, Mayanak said "my brother was a late riser and never went for morning walk", countering what police had suggested in the case.
"During discussions, he told me that he was working on some files which can expose a big scam," Mayank said.
"I request you (police) to investigate the mysterious death of my brother on May 17," Mayank said in the complaint on which the FIR was lodged.
He had written to the Prime Minister's Office too demanding a CBI inquiry into his brother's death.
In his letter, he claimed that Anurag had stumbled upon a major scam about which he wanted to inform the PMO and CBI.
Sushila Devi made a fervent appeal to the prime minister and chief minister seeking justice for her son.
The UP police had constituted the Special Investigation Team (SIT) on May 18 to probe the death.
The issue took a political colour after opposition members raised the matter vociferously in the Uttar Pradesh Assembly to question the law and order situation under the BJP government. The Assemly premises are hardly a kilometre from the spot where Anurag's body was found.
Tiwari, a 2007-batch IAS officer, was staying at the Meera Bai guest house with a batch mate after attending a mid-career training programme at Lal Bahadur Shastri National Academy of Administration in Mussoorie.