The trial in the US of Pakistani-Canadian Tahawwur Rana, co-accused in the 26/11 Mumbai attacks case, is throwing new light on the conspiracy to carry out the worst terrorist strike in India, Indian Ambassador to America Meera Shankar said today.

She said the trial of Rana, who helped Lashkar-e-Taiba operative David Coleman Headley in conducting recce of the 26/11 targets, was going on in a Chicago court where fresh revelation was coming out.

"Headley is one of the key witnesses in the trial. It is going on. Revelation is coming out. This shedding new light on the full details of the conspiracy for the Mumbai terror attacks," she said when asked about the Chicago court proceedings.

The envoy was speaking to reporters after meeting Home Minister P Chidambaram.

Testimony of Headley in the court confirmed Pakistan's spy agency ISI's involvement in the conspiracy to carry out the Mumbai carnage.

"ISI did provide me (espionage) training," Headley has told the court. The training by the Pakistani spy agency to Headley was provided by Major Iqbal, who was his ISI handler, on the streets and in a two-storey safe house in Lahore near the airport.

Shankar said she discussed with Chidambaram about his meeting tomorrow with US Secretary of Homeland Security Janet Napolitano.

"I have discussed with the Home Minister about the Homeland Security dialogue that he will have with US Secretary of Homeland Security...," she said.