"People held in Pakistan in connection with the Mumbai attacks should be brought to justice," US Ambassador to India Timothy J. Roemer told reporters when asked whether the US would press Pakistan to act against Saeed, the alleged mastermind of the Mumbai carnage, amid Islamabad's vacillation over the issue.

Underlining its resolve to bring the architects of the Mumbai terror spree that also killed six Americans to justice, the US envoy said FBI officials would be testifying in the trial of Ajmal Kasab, the lone Mumbai attacker in Indian custody, in Mumbai this week.

Roemer's remarks come soon after Pakistan Supreme Court's decision to postpone indefinitely the petitions challenging the release of Saeed -- the founder of Jamaat-ud-Dawa, a front for the Lashkar-e-Taiba -- that virtually left the Mumbai mastermind free. The court cited the lack of evidence against Saeed while announcing its decision.

Despite India's repeated insistence that it has given enough evidence against Saeed, an India-hating demagogue known for his fiery Friday sermons, Pakistan has been vacillating, asking for more proof.

Roemer, a former member of the House of Representatives who served on the 9/11 commission investigating the Sep 11, 2001 terror attacks on the US, was addressing his maiden press conference as the US envoy to India after he presented his credentials to President Pratibha Patil Tuesday.

"The US will work with India in broadening and deepening counter-terror cooperation. We share a common understanding of the enemy," he said while referring to assorted militant outfits like Lashkar-e-Taiba operating in the region.

"We are pressing Pakistan hard on the Mumbai suspects," he said.

"The US' position is firm, resolute and bold. We are committed to shutting down terrorists' networks and financing of those networks to bring the perpetrators of the bloodthirsty attacks to justice."

Roemer said he conveyed President Barack Obama's personal greetings to Patil Tuesday and underlined that Obama considers India "one of the most important partnerships for America's future".

The envoy also said Obama was looking forward to weloming Prime Minister Manmohan Singh to the White House in Washington Nov 24.

Alluding to the wide-ranging strategic partnership and people-to-people contacts between the two countries, the envoy said the Obama administration has "an ambitious agenda" on India-US ties which he plans to pursue vigorously as his envoy in New Delhi.