Napolitano, who visited India last week for talks on anti-terrorism, renewed her assertion that LeT was in the same league as al Qaeda in US eyes.
"LeT is a potent terrorist organization. It could be construed as a threat to the United States. It certainly is to India," Napolitano said.
"It is al Qaeda-like in its strength and organization," she said at the Center for Strategic and International Studies, a Washington think-tank.
India believes the LeT and the Inter-Services Intelligence (ISI) staged the 2008 attacks in Mumbai, which left 166 people dead and severely strained relations between the two neighbours.
David Coleman Headley, a Pakistani American who admitted scouting sites for the Mumbai attacks, has testified in a trial in Chicago that the ISI has supported LeT despite an official ban on the group.
Napolitano stayed tight-lipped about her talks with India on Lashkar-e-Taiba but said that her counterparts did not ask her specifically to ask Pakistan to turn over suspects in the Mumbai assault.
"The United States believes that it is in everyone's interest for India and Pakistan to be able to work together," she said.
Relations between India and the United States, the world's two largest democracies, have improved rapidly in the past decade. But many Indian policymakers are uneasy about the close US cooperation with Pakistan.
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