The deaths of dozens of protesters has further eroded scant trust in the security forces.
Opposition leader Bobi Wine says the security forces have besieged the headquarters of his party.
Nape Nnauye caused outrage for saying he could help an MP rig elections - comments, he said, he made in jest.
Authorities warn sodium cyanide can be lethal after pots of the chemical were looted from a lorry.
Morocco's Noor Slaoui will become the first person from the Middle East and North Africa region to compete in eventing at the Olympic Games.
Ex-security guard, Louis van Schoor, killed dozens in South Africa but was only jailed for seven murders.
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