kampala ugandan police arrest 10 youths stag illegal rally oppose plan constitutional amendment allow president yoweri museveni one world long serve rulers run fresh term police spokesman emirian kayima say monday youths detain capital kampala mobilize support distribute fliers message oppose amendment involve illegal assembly inform police ahead time go hold rally tell reuters add question would take court museveni 73 come power 1986 bar seek re-election law limit presidential candidates 75 years age next presidential election 2021. uganda africa big coffee exporter prospective oil producer plan underway change constitution museveni eligible move stir anger critics say museveni use security force maintain power opposition leaders activists often jail rally meet often ban break teargas beat museveni say whether intend stand officials say removal age cap benefit future leaders museveni specifically uganda police arrest youths oppose fresh term ruler power since 1986