Zimbabwe's Movement for Democratic Change (MDC) has said it could take to the streets to challenge President Mugabe's victory in elections it rejects as a farce.
"Demonstrations and mass action are options," party spokesman Douglas Mwonzora said.
Members of Zimbabwe's opposition say they have been targeted by Mugabe supporters following the president's re-election.
President Robert Mugabe's declaration as winner has been met by international concern over the conduct of the African nation's poll.
Robert Mugabe has secured his grip on power in Zimbabwe today after his party ZANU PF won a majority in parliament in Wednesday's election.