India News: Vijay Singla, nephew of Railway Minister Pawan Kumar Bansal, and three others were on Saturday sent in CBI custody for four days by a Delhi court which said it was necessary to find out the 'actual beneficiaries' and other conspirators who were involved in the bribery case.<br /><br />Special CBI Judge Swarana Kanta Sharma allowed the agency to interrogate Singla and three other persons Sandip Goyal, Dharmendra Kumar and Vivek Kumar till May 7.