Supporting India's views on involvement of Pakistan-based terror outfits in Mumbai attacks, the US has said those involved in the strikes have links in Islamabad.

US Assistant Secretary of State for South and Central Asian Affairs, Richard Boucher, has said those involved in the Mumbai terror attacks have links in Pakistan.

"I would say it's clear that they had links in Pakistan, that the attackers had links that lead to Pakistani soil" Boucher said in Islamabad on Monday, according to transcripts released by State Department in Washington on Wednesday.

"And as far as exactly what those links were and who they were attached to and how they did this, I think that's a matter that's still under investigation," Boucher told reporters in response to a question.

Boucher, who talked with Pak leadership on this issue at length, reiterated that whoever was involved in this, needs to be held responsible. "But I also wouldn't jump to any particular conclusions," he said.

"It's important that anybody who was involved in this, in the planning and execution of this act, be brought to justice and held accountable. I think leaders in Pakistan are determined to do that. They're determined to pursue the investigation. And we'll have to watch as it unfolds to see where it leads," he said.

When asked about evidence given by India to Pakistan on Mumbai attacks, Boucher refrained from passing any judgment at this stage as the investigations were still on.

"I think we're at the stage where people need to share information, follow up leads, and determine everything they can about what happened," Boucher said.