Expressing its appreciation for Prime Minister Manmohan Singh's willingness to take political risks in resuming a dialogue with Pakistan, the US has again asked Islamabad to take effective action against anti-India terror groups like the Lashkar-e-Taiba (LeT), blamed for the 2008 Mumbai terror attack.

"We don't distinguish among terrorist or violent extremist groups who operate out of Pakistan. That means acting as effectively against groups like Lashkar-e-Taiba as well," US Undersecretary of State William Burns said Tuesday ahead of the first India-US strategic dialogue starting Wednesday.