A banned charity with alleged links to the Mumbai terror attacks is helping people fleeing the fighting between the Pakistani military and the Taliban, group members said Thursday, raising questions about the government's pledge to crack down on the organization.

Around 2,000 former members of Jamaat-ud-Dawa are handing out food and transporting refugees at three centers, said a member of the group, which is using the new name Falah-i-Insaniat Foundation but the same logo as the outlawed group.

The offensive against Taliban insurgents in the Swat Valley area has driven at least 800,000 people from their homes, with 80,000 staying in several camps south of the battle zone. Prime Minister Yousuf Raza Gilani told Parliament on Thursday that it was the largest internal displacement of Pakistanis since the country's creation in 1947.

"They are sacrificing for the future, and every Pakistani is ready to help them," he said of the refugees.

The military claims to have killed about 800 militants in the operation so far, including 54 announced on Thursday. Troops have fought their way to within four miles (six kilometers) of Swat's main town, Mingora, spokesman Maj. Gen. Athar Abbas said. Nine troops also died in the previous 24 hours, he said.

The offensive is shaping up as a major test of the Pakistani army's often questioned commitment to uprooting the insurgency gnawing away at the stability of the nuclear-armed, pro-Western state, but the exodus could undercut support for the fight.

The U.S. and the U.N. say Jamaat-ud-Dawa is a front for Lashkar-e-Taiba, the militant group accused of planning and carrying out last year's attacks in the Indian financial capital of Mumbai, which left 166 people dead and hundreds more wounded. Jamaat denies the charge.

The government launched a crackdown on the charity soon after the attacks, arresting several of its leaders, seizing its assets and closing its branches.

Pakistan's crackdown on Jamaat was welcomed by India and the United States, but analysts at the time said it was likely the group would emerge under another name.

"We are silently helping the homeless, hungry and needy people, and let us do our work without maligning us," said Mian Adil, deputy chairman of Falah and a former member of Jamaat. "We have sent 2,000 of our members to help our brothers and sisters."