Mr Karume's ruling CCM (Chama Cha Mapinduzi) has also retained its majority in the legislature, with 30 seats against 19 for the CUF.

BBC: NEWS | Africa | Zanzibar president wins elections

Some walked for days for the chance to show their anger by publicly giving up their membership cards for Tanzania's ruling party, Chama Cha Mapinduzi (CCM).

BBC: Tanzania's Maasai battle game hunters for grazing land