WASHINGTON - The United States has renewed its call for the release of hunger-striking Pakistani doctor who was sentenced to 33 years for helping in the hunt for Osama bin Laden, saying he should never have been imprisoned.“We believe and have believed all along that the prosecution and conviction of Dr (Shakeel) Afridi sends absolutely the wrong message, particularly with regard to our shared interest in taking down one of the world’s most notorious terrorists,” State Department spokesperson Victoria Nuland told reporters at the daily press briefing on Thursday.She was answering a question whether the United States was concerned about the safety of Dr Afridi, who reportedly went on hunger strike in a Peshawar prison to protest of his detention. “We’re worried about all of it, because he should never have been locked up to begin with,” Ms Nuland added. A tribal court in Khyber Pakhtunkhwa convicted Dr Afridi of treason after he agreed to collect DNA for US intelligence to verify the presence of the most-wanted Al-Qaeda leader. “We’ve made our views well known, both to Pakistanis and in public. We are, as you know, in the middle now of a series of working group meetings with the Pakistanis. So that gives us a chance to raise our concerns about the hunger strike and other things, and we are doing that,” the spokesperson said, adding that the US wants to see him released.