India's Solicitor General Gopal Subramanium and US Attorney General Eric Holder discussed the modalities during their meeting on Tuesday, Apr 27.
The meeting was also attended by Indian Ambassador Meera Shankar and other US Justice Department officials.
"The two partners agreed to take suitable steps to bring about direct access by Indian authorities to David Headley as soon as possible," the Indian embassy said. There was no comment from the US side.
"The partnership between India and the United States recognizes the high priority to be accorded to each country's national security," Indian officals said adding, "Both countries recognised the need for the investigations to reach a fruitful and successful outcome.
""The discussions have resulted in a mutual commitment that there would be the best possible cooperation in our common fight against terrorism," they said.
The visit to discuss the modalities was made by Subramanium following US President Barack Obama's assurance to Prime Minister Manmohan Singh to provide India's access to Headley, during their meeting on the sidelines of Nuclear Security Summit in Apr 2010.