The United States says it is deeply concerned over the release this week of a Sudanese man facing the death penalty in connection with the killing of a US diplomat 15 years ago.

The Sudanese authorities on Monday freed Abdel-Raouf Abu Zaid, who was convicted over the killing of John Granville and his Sudanese driver Abdel Rahman Abbas.

They were shot dead by Islamist gunmen on New Year's Day 2008.

The State Department denied that the release was part of an agreement by both countries.

It said it was troubled by the lack of transparency in the legal process.

Source: BBC