Calcutta, Jan. 30 :    Calcutta, Jan. 30:  They posed as CBI officers to extort money; they joined hands with local criminals to pull off the Khadim's abduction; they probably had a behind-the-scenes role to play in the American Center attack. Picked up two days ago for interrogation, the terror trio - Mohammad Khalil, alias Rahul, Mohammad Shakeel, alias Rohit, and Mohammad Naushad - was formally arrested and charged with an abduction bid. They were produced in court on Wednesday and remanded in police custody till February 12. Sleuths had been on the trail of the trio ever since they received intelligence reports that Dubai-based don Aftab Ansari had 'three more men on the loose in Calcutta'. All in their thirties, the three were recruited by Aftab Ansari to assist Asif Reza, the man allegedly in charge of Terror Tuesday's operation. The trio was picked up from a south Calcutta hideout by officers of the anti-terrorist cell two days ago. The CID is now set to ask for their custody for interrogation in connection with the abduction of Khadim's vice-chairman Parthapratim Roy Burman. Inspector-general of police (CID) Partha Bhattacharya said 'the trio was very much part of the Asif Reza network in the city.' A senior police officer said the three had made elaborate plans of abducting six top businessmen, including a shipping magnate and a garments dealer, prior to the Khadim's abduction. 'We have evidence to back our case that Naushad and company had actively assisted the collaborators of the Khadim's abduction and had played a key role in the case'. On September 17, 2000, the trio, posing as CBI officers, approached a Free School Street-based shipping magnate and asked him to accompany them to their office for interrogation on some business deals. The businessman, however, managed to inform the police. 'What they did not know was that another extortionist, Abdul Ghani Gaffar, arrested in November last year, had made several attempts to abduct the same businessman and had also shot at him once. The businessman was, therefore, careful about whom he was meeting,' said a top detective department official. After the failed abduction bid, the trio continued to threaten the businessman and later aborted two more abduction plans, before joining hands with Asif Reza, Happy Singh and Arshad Khan to hatch the conspiracy to abduct Roy Burman.