Indian prime minister Manmohan Singh said the world must press Pakistan to stop supporting terrorists who continued to target India.

Mr Singh, speaking in Washington on the eve of an elaborate White House state visit, also urged Pakistan to bring to justice those who planned the Mumbai terror attacks, which left 166 people dead a year ago.

He said it was the right decision to resist the "inordinate pressure" he faced to respond to the attack that shocked and angered India.

But Pakistan "should be pressurised by the world community to do much more to bring to book all those people who are responsible for this horrible crime", Mr Singh said at the Council on Foreign Relations, adding: "The trauma of the attack continues to haunt us."

He urged his neighbour to control the terror groups that he said had moved from the border region with Afghanistan into Pakistan's heartland. Failure to do so, Mr Singh said, would result in serious consequences for the stability of both Pakistan and India.

The White House state visit for Mr Singh, the first in President Barack Obama's White House, is meant to show the US administration's eagerness to win Indian co-operation on counter-terror, trade and climate change initiatives.

India, however, has watched with wariness as Obama has lavished attention on rivals Pakistan and China.