Chandigarh: Ludhiana police detained four Bangladeshi suspects in connection with the March 14 rape of nun in Ranaghat in West Bengal and cases of robbery and foreign money transactions worth several millions. Their detention comes after two key accused Mohammed Salim Sheik and Gopal Sarkar were arrested by West Bengal Police in Mumbai and Delhi. Bengal police had circulated photos of four culprits to state police authorities across the country. The police were trying to ascertain the role of the detained four in the March 14 incident. "They are part of the same gang under which two key rape accused had been arrested. These four men have committed crimes of burglary, theft and defrauding people of foreign currency" said Ludhiana ADCP crime Mukhwinder Singh. The four men are illegal immigrants and were also wanted in the cases of extortion, fraud, illegal transfer of foreign currency in Punjab. The police said that they had rented out a two-storey accommodation on Chandigarh Ludhiana state highway but would use it as a transit arrangement to travel between different states.