Pakistani security forces on Sunday raided a camp used by Lashkar-e-Taiba (LeT), two sources said, in a strike against the militant group blamed by India for last month's deadly attacks on Mumbai. Local man Nisar Ali said that the operation began in the afternoon in Shawai on the outskirts of Muzaffarabad, the capital of the Pakistani side of disputed Kashmir region. "I don't know details as the entire area was sealed off, but I heard two loud blasts in the evening after a military helicopter landed there," Ali said. An official with the Jamaat-ud-Dawa charity, which is linked to LeT, said security forces had taken over the camp. India has demanded Pakistan take swift action over what it says is the latest anti-India militant attack emanating from Pakistani soil. No comment on the raid was immediately available from Indian officials. Pakistani territory was used to stage the attacks on Mumbai, U.S. Secretary of State Condoleezza Rice said on Sunday, again urging Islamabad to help bring the perpetrators to justice. "I think there's no doubt that Pakistani territory was used, by probably non-state actors," Rice told CNN's "Late Edition." She has just returned from a trip to the region to urge cooperation between the old enemies India and Pakistan. "I don't think that there is compelling evidence of involvement of Pakistani officials," she added.