Washington: The US has said that there is no substantiation of any direct link between the Inter Services Intelligence of Pakistan and the Haqqani network.

"I don't have any evidence of that (the link between ISI and the Haqqani network) either way," US State Department spokesman Mark Toner said on Tuesday.

When asked about news reports on links between ISI and Haqqani network, Toner said, "We remain committed to working with Pakistan on counterintelligence or counterterrorism operations. We believe they've been successful to date."

Toner said there are challenges in the relationship with Pakistan but the US is committed to working through them.