DHAKA (Reuters) - Bangladesh police arrested another foreign militant on Saturday, raising to four the number of activists detained from the Pakistan-based group, Lashkar-e-Taiba (LeT) in six days, a senior police officer said. Explosives and bomb-making materials were captured, along with a Bangladeshi accomplice, at a hideout at Tongi, on the outskirts of the capital Dhaka. We have made the latest haul in a continuing crackdown on militancy, Mohammad Sohail, a senior officer of the elite Rapid Action Battalion force told a news conference. Police on Monday arrested three militants, all Pakistani citizens, including the LeT chief in Bangladesh, at a Dhaka hotel. Sohail said another RAB raid on Friday had netted a large explosives cache in another outlying district. In recent months, police have arrested dozens of militants, including several Lashkar activists, in Bangladesh.