Demonstrators clash with police at Rio protest against Temer Riot police in Rio de Janeiro set off tear gas grenades at the end of a demonstration Thursday evening, after a group of hooded protesters threw rocks and Molotov cocktails at security forces. Earlier, thousands of demonstrators marched downtown against Brazilian president Michel Temer, who refused to step down after being put under investigation for allegedly authorizing payment of hush money to a politician imprisoned for corruption. IMAGES AND SOUNDBITES