Opposition head Morgan Tsvangirai and former vice president Joice Mujuru fled the rally in their cars while protesters ran for cover.
A court this month sentenced a policeman to life in prison for shooting dead a taxi driver over a fare dispute.
Endless Uganda police brutality against Museveni rivals, plenty of condemnation, but nothing changes - rights group
IMF has cut its Ugandan growth forecast to 5%, citing global shocks and nervousness over elections that had contributed to sharp decline in shilling.
From aborted presidential meetings and shocking airport battles, to spoilsport militants and railway thieves: the continent's best of the worst.