kampala uganda main opposition leader arrest charge murder police say friday break rally organize protest move extend president yoweri museveni rule kizza besigye contest lose four elections long-time leader museveni detain thursday police blame besigye deaths two protesters wednesday rally officer fire bullets teargas clash government opponents besigye colleagues lead youths stone police cause deaths police spokesman denis namuwoza tell reuters wednesday clash rukungiri near rwandan border one several violent anti-museveni protest spread across uganda since president last week first time openly express support propose legislation aim allow stay power office three decades 73-year-old museveni would bar run next election 2021 law cap age presidential candidates 75. propose legislation would remove age ceiling besigye museveni former physician guerrilla struggle bring power 1986 claim four elections pair contest rig something museveni deny president staunch western ally widely see anchor stability east africa often volatile great lakes region deploy troop somalia help fight islamist group al shabaab earn plaudits western backers heavy-handed tactics besigye arrest near rwandan border thursday along two senior officials opposition forum democratic change fdc police spokesman namuwoza say charge murder assault incite violence unlawful assembly transfer prison near capital kampala immediate reaction arrest uganda opposition propose new law widely see critics pave way museveni rule life similar move democratic republic congo burundi spur unrest civil society organizations accuse help rally support extend museveni rule premise raid offices search equipment confiscate two great lakes institute strategic study gliss think tank actionaid south africa-based international charity bank account freeze police order statement thursday u.s. embassy kampala criticize call heavy-handed tactics security force say harm democracy government must protect people right assembly expression say ugandan opposition leader hold murder charge protest