The US State Department spokesperson Victoria Nuland echoed Carney at her daily press briefing.
"With regard to Dr Afridi, I think the Secretary (of State Hillary Clinton) was extremely clear last week about what we think about this, that he shouldn't have been locked up or charged in the first place," she said.
"We've been absolutely clear, publicly and privately, that we think it's wrong he's locked up, we think it's wrong that he's being prosecuted and that in fact the role that he played
did a service not only for the world and the United States but obviously for the security of Pakistan. This (Osama) was one of the biggest killers out there," Nuland said.
Meanwhile, the State Department has announced that Under Secretary of State for Public Diplomacy and Public Affairs, Tara D Sonenshine is travelling to Islamabad and Lahore from May 30 to June 2.
During her visit, Sonenshine will engage with civil society and emphasise people-to-people ties shared between the US and Pakistan, it said. "She will meet with young Pakistani entrepreneurs and female students to discuss the shared goal of empowerment and to discuss ways to unlock their full potential. "She will also meet with Pakistani alumni of US State Department exchange programmes," the US State Department said.