Australia on Sunday joined the United States and Britain in questioning the credibility of elections in Zimbabwe, with Foreign Minister Bob Carr calling for a re-run of the polls.

Zimbabwe’s 89-year-old Robert Mugabe won a landslide victory in last week’s presidential and parliamentary polls, but his rival Morgan Tsvangirai described the vote as “fraudulent” and vowed to boycott the government.

Carr said he was calling for fresh elections after concerns had been raised, including by Australia’s embassy in Harare, about the voters roll and voting procedures.

“These appear to have disenfranchised large numbers of voters and raised doubts about the credibility of the election results,” Carr said in a statement.

“Given our doubts about the results, Australia calls for a re-run of the elections based on a verified and agreed voters roll.”