Prime Minister Morgan Tsvangirai dismissed Zimbabwe’s election as a farce on Thursday after his rival President Robert Mugabe’s party claimed a landslide victory that would secure another five years in power for Africa’s oldest head of state. Speaking to reporters at the headquarters of his Movement for Democratic Change (MDC), a downbeat Tsvangirai said Wednesday’s vote should be considered invalid because of polling day irregularities and vote-rigging by 89-year-old Mugabe’s ZANU-PF party. “This has been a huge farce,” Tsvangirai said. “In our view, that election is null and void.” He did not take questions, leaving it unclear whether he or his party will mount any kind of legal challenge. The conflicting claims from the two main competing camps came even before Zimbabwe’s Electoral Commission had issued any official results, expected by Monday. The largest independent observer group said the credibility of the poll was compromised because of voter registration irregulaties, with thousands being disenfranchised. Wednesday’s voting was peaceful across the southern African nation but the MDC’s outright rejection of the vote raises the prospect of an acrimonious dispute. It also increases the chances of a repeat of the violence that followed another contested poll in 2008 in the southern African nation, which has rich reserves of minerals such as chrome, coal, platinum and gold.