US Undersecretary of State William Burns visiting India said on Thursday that President Barack Obama's administration was piling pressure on Pakistan to bring those guilty of last year's Mumbai attacks to justice.
India blames neighbouring Pakistan for harbouring those who planned the attacks, and one Pakistani national is on trial in Mumbai accused of being the only gunman who survived.
"Pakistan has a special responsibility to act immediately and fully and thoroughly," William Burns told reporters in New Delhi.
"We continue to push hard for the Pakistani government to act firmly to bring those responsible to justice and more broadly to crack down on terrorist infrastructure," he said.
The Pakistan-based Islamist group Laskhar-e-Taiba is widely thought to have been behind the attacks, in which 166 people were killed and more than 300 wounded.
Burns, the US's senior career diplomat, also announced that Secretary of State Hillary Clinton would visit India next month in her first trip to the country in her new role.
"The secretary's visit is a reflection of the importance attached to this relationship," he said after talks with Prime Minister Mamohan Singh, who was returned to power in recent elections.
{{/usCountry}}"The secretary's visit is a reflection of the importance attached to this relationship," he said after talks with Prime Minister Mamohan Singh, who was returned to power in recent elections.
{{/usCountry}}"She wanted to do it quickly after the formation of the new government precisely to seize the opportunity before us to try to build on the foundation that already exists in our partnership," he said.