The Tanzanians searching for their grandfathers' skulls in Germany

Isaria Anael Meli has been looking for his grandfather's remains for more than six decades.

He believes the skull ended up in a Berlin museum after his grandfather, Mangi Meli, along with 18 other chiefs and advisers, was hanged by a German colonial force 123 years ago.

After all this time, a German minister has told the BBC the country is prepared to apologise for the executions in what is now northern Tanzania.

Other descendants have also been searching for the remains and recently, in an unprecedented use of DNA research, two of the skulls of those killed have been identified among a museum collection of thousands.