Zimbabwean opposition leader Morgan Tsvangirai on Saturday postponed his expected return home to contest an election run-off after his party discovered an assassination plot against him, his spokesman said.

Movement for Democratic Change leader Tsvangirai has been out of Zimbabwe for over a month and had been due to return from Europe on Saturday to campaign for the June 27 second round ballot against President Robert Mugabe.

“We have received information from a credible source concerning a planned assassination attempt against President Tsvangirai,” said spokesman George Sibotshiwe.

Tsvangirai had won the first round on March 29, but not by enough votes to avoid a second round against Mugabe, who has ruled Zimbabwe for nearly three decades.

The March elections were followed by widespread violence, which the MDC says left at least 40 of its supporters dead and scores of others injured.