The CBI sleuths are presently raiding his office and home in Kolkata.

He is the second high-ranking officer of the Special Crime Branch of CBI Kolkata to be arrested. On August 23, 2007, a month before his retirement, A K Sahay, SP, was arrested on charges of extortion and amassing wealth disproportionate to his income. Sahay was in-charge of the SCB Kolkata and immediate superior of Bose.

“The DSP has been asking for bribe of Rs 50,000 from a person and harassing him. After receiving the complaint, our special team from Delhi Anti-Corruption Branch went to Kolkata. A trap was laid and he was caught red handed,” said a source from Delhi.

According to the CBI, one Avatar Singh, a truck operator from Kolkata, lodged a complaint with the agency saying that the DSP was asking for a bribe of Rs 50,000 and threatening to implicate him in a murder case of a DRI officer in Guwahati in 2006.

On September 12, 2006, Tarun Kumar Dutta, an officer with the Directorate of Revenue Intelligence, who had reportedly intercepted drug consignments, estimated to be worth over Rs 40 crore in the international market, was shot dead by Assam-based drug mafia kingpin Samsul Haque Talukdar alias Pakhi Mian in Guwahati. Pakhi Mian was arrested this year on April 22 by the West Bengal Police from Baguiati. The SCB is investigating the case.

“According to Avatar Singh’s complaint, Bose said his garage was frequented by one Munna Musalman, a co-accused of Pakhi Mian. And Bose, who is investigating the case threatened him that he will implicate him in the murder case if he fails to shell out Rs 50,000. He made a number of phone calls to Singh and also met him personally to harass him,” said another source.

So a trap was was laid and Avatar called up Bose to arrange for a meeting to

give the bribe. Bose and Singh fixed the venue at Ultadanga crossing. Bose was caught when he arrived on the spot at 12.10 p.m. and received the cash.

Teams also raided his office in Salt Lake and his residence in Ultadanga. The raids were on till last reports came in.

Bose, who was leading investigation into a number of high profile cases, including Chota Angaria massacre, Tagore Nobel prize theft from Santiniketan and Tapasi Muder case, is one of the most important CBI officers in Bengal. He faced sharp criticism from ruling CPI(M) when he arrested Suhrid Dutta, party’s Hooghly district committee member and his accomplice Debu Malik in Tapasi Malik murder case. The duo were recently convicted to life in a lower court. Bose was also criticised by the ruling party in his investigation on the Chota Angaria case.