Zimbabwean police fired teargas and water cannon as opposition supporters gathered for a protest march in the capital, Harare, on Friday.
The anti-government supporters responded by hurling rocks after More than a hundred police officers were trying to suppress their protest against President Robert Mugabe.
They have also beaten up people wearing red T-shirts, the colour of the opposition Movement for Democratic Change party (MDC),
Mugabe's opponents have raised public anger and protests over an economic meltdown, cash shortages and high unemployment. Mugabe, 92, has led Zimbabwe since independence from Britain in 1980.
Protesters are calling for electoral reform ahead of polls in 2018, as Mugabe is intended to stand again.
Leaders from 18 opposition political parties have called for Zimbabweans to march through Harare today as part of a so-called "mega demonstration".
But when people arrived, they were told by the police to leave despite The High Court Friday decision that the planned opposition march could go ahead."We are not going anywhere and demonstrating is the only solution left to force the dictator out of office,"
said one of the protesters, Tapfuma Make.