In a joint statement they condemn the frequent use of lengthy pre-trial detentions and the common practice of changing the charges.

The two countries singled out the case of top investigative journalist Erick Kabendera, who was charged on Monday with money-laundering, tax evasion and leading organised crime.

He was arrested the previous week initially over concerns about his citizenship.

The statement condemns Mr Kabendera's mistreatment:

We are particularly concerned about a recent case - the irregular handling of the arrest, detention, and indictment of investigative journalist Erick Kabendera, including the fact that he was denied access to a lawyer in the early stages of his detention, contrary to the Criminal Procedures Act."

The joint statement also urges Tanzania's government to guarantee due process to its citizens, "which it has recognised as a basic human right"