Obama, on whose invitation the Prime Minister is visiting Washington next month, also said that he looked forward to receiving Singh in the US capital.

The US President talked by phone with Singh on Saturday, a day after the Indian leader called him to congratulate on winning the Nobel Peace Prize for the year 2009.

"Late Saturday morning, President Obama returned Indian Prime Minister Singh's phone call. Prime Minister Singh had called President Obama on Friday to congratulate him on having won the Nobel Peace Prize," the White House said in a statement.

"The President also underscored his concern for the attack on the Indian Embassy in Kabul and said that he looked forward to receiving the Prime Minister in Washington later this year," the statement said.

Singh will be paying the first state visit of the Obama Administration in November.
"The President expressed his appreciation for the call and congratulations. He noted that he was humbled and grateful for having received the Nobel, and that he saw it as a call to collective action on shared challenges," the statement said.