Pakistani security forces raided a camp of a charity run by the founder of Lashkar-e-Taiba, the group India accuses of involvement in the Mumbai attacks, and arrested 15 people, officials said Monday. The arrests took place Sunday as international pressure mounted on Pakistan to take action against LeT, the banned Islamic group seen as the prime suspect in the devastating Mumbai siege. "Yesterday evening security forces raided a relief camp set up by Jamaat-ud-Dawa... Fifteen people were arrested," a security official said. Jamaat-ud-Dawa is run by Hafiz Saeed, who founded Lashkar-e-Taiba in 1989. He abandoned the group when it was banned after India alleged it was behind an attack on parliament in New Delhi in 2001. "The raid was carried out to get details about the activities of the group in Kashmir in the wake of allegations by India that LeT (Lashkar-e-Taiba) was using Pakistani territory for training," an intelligence official said. The 15 arrested were members of the local branch of the charity, the official said. Senior government officials refused to confirm or deny the arrests, which came as US Secretary of State Condoleezza Rice urged Pakistan to act quickly. Rice said there was evidence the country's soil had been used by "non-state actors" to mount the attacks. "I do think that Pakistan has a responsibility to act," she said in a television interview Sunday.