Two British nationals were detained by security agencies at a five star hotel near the IGI airport in New Delhi after they were believed to be indulging in some suspicious activities. <br/><br/>Police today said the foreigners were detained yesterday after officials of Raddison Hotel in south-west Delhi suspicious about the activities of Stephen Hampston and Steve Martin , who had checked in four days ago.<br/> <br/>Talking to reporters, Delhi Police Commissioner Y S Dadwal said they have been deatained because of suspicious activities.The police got a tip-off that the duo was carrying sophisticated technical equipment which could be used for air surveillance.<br/><br/>Delhi police has also recovered high-tech binoculors from them. Investigators of Delhi Police's Special Cell and Intelligence Bureau are questioning them.<br/>