A police team will leave for Kolkata, on Monday, to seek the custody of Abdul Rauf Daud Merchant, sharp shooter of Chhota Shakeel faction of Dawood Ibrahim gang and alleged killer of audio king Gulshan Kumar. Merchant was arrested on January 10 from a hotel along with his wife. He was produced before a Kolkata court, which remanded him to police custody till January 20. The arrest has boosted the morale of the Mumbai Police, which recently suffered a set back following a verdict of London High Court discharging prime accused and noted music composer Nadeem Akhtar Saifee in an extradition case filed by the Indian government. With Merchant`s arrest, police expects to achieve a major breakthrough because he has already disclosed his involvement in the ghastly murder of the audio king on August 12, 1997. Bureau Report