Indian intelligence agencies have begun a hunt for Sheikh Abdur Rahman, the alleged mastermind of 434 bombings in Bangladesh this month which killed two people and injured more than 150. Bangladesh's most-wanted man is believed to have slipped into India's West Bengal province with armed accomplices to evade the police dragnet in his country. West Bengal, adjoining Bangladesh, has a substantial Muslim population. It is also home to an ever-growing population of illegal Bangladeshi immigrants. Bengal and Bangladesh share a common language - Bengali - and culture. 'The intensive search operation under way is exceedingly difficult and challenging,' said an Indian government official. Rahman is the supreme leader of the banned Islamist militant group Jumatul Mujahedeen, based in southern Satkhira district. Besides requesting that India hunt down Rahman - described as Saudi-educated and Taleban-trained - Bangladesh has sought help from Paris-based Interpol. Bangladesh charged Rahman in absentia on Friday. Investigators say that those involved in the simultaneous blasts across the country on August 17 were sending a message that they were capable of bigger and deadlier attacks. Leaflets found at blast sites demanded the introduction of Islamic law in Bangladesh and criticised the presence of US and British troops in Iraq and Afghanistan. An official disclosed that while Indian security agencies were building up a lot of background information on Rahman and his accomplices, they had no real new leads. 'But if they are hiding in India, we will find them,' he said. Analysts say New Delhi has a vested interest in nabbing Rahman because of his strident anti-India stand. Jumatul Mujahedeen accuses Hindu-majority India of trying to colonise Bangladesh and grab its natural resources.