Four men allegedly spying outside the CBI director Alok Verma’s residence were held by his personal security officers (PSOs) on Thursday morning, a police officer said. The men, Prashant Kumar, Vinit Kumar Gupta, Ajay Kumar and Dhiraj Kumar Singh, identified themselves as officers of the Intelligence Bureau, to the security team, according to the police. They have submitted their identity proofs and government health scheme and Aadhaar cards.