Mumbai, Feb. 26 :    Mumbai, Feb. 26:  The Chori Chori Chupke Chupke case has taken a curious turn, with police questioning Bollywood heart-throb Shah Rukh Khan on his business association with arrested producer Bharat Shah. Khan was called to the crime branch office yesterday, where he was questioned for more than three hours, said assistant commissioner of police Sanjay Kamble, who is investigating the case. This is the first time the actor has been called for questioning. Actor Salman Khan was also called to the crime branch office for the second time and grilled for three hours. Shah Rukh was not involved in the Hindi blockbuster, which police claimed Chhota Shakeel, a Dawood Ibrahim confidant, had funded despite Shah's assertion that he was the financier. The police said they questioned Shah Rukh mostly on Shah's stake in srkworld.com, a dotcom project owned by the actor and Juhi Chawla. He was also queried on Shah's films he had worked in. Shah Rukh was asked if he received extortion threats from the underworld, but the police refused to divulge his replies. A police officer said they did not find anything incriminating against the actor, but were still investigating him. Police said Salman was questioned about his involvement in Chori Chori Chupke Chupke where he starred with Rani Mukherjee and Preity Zinta. He was repeatedly asked whether he had acted under duress or if he had received any threat to his life. Salman said he had acted of his own accord. He pleaded ignorance about any mob-involvement in the film. Shah Rukh told the police that his association with Shah was industry-related. He said he had known the financier because he was the biggest name In the industry and 'everyone knows him for some reason or the other'. He said he had no idea that Shah had any links with the underworld when he joined hands with him to launch the srkworld.com. Sources said the actors were interrogated as part of a police effort to file a chargesheet against Shah, held under the Maharashtra Organised Crime Act. Under the harsh law known as mini-terror, the police will have to file a chargesheet within 180 days of an arrest which ends on Wednesday. The police said investigation into Bollywood's alleged links with the underworld would continue and they expected more people in the industry to come under their net.