AlHijjah 1, 1434, Oct 6, 2013, SPA -- Supporters of Cambodia's opposition party are staging another mass rally in the capital to protest the country's disputed July election, AP reported. The opposition rally Sunday in Phnom Penh is part of a push to demand an independent probe be set up to investigate alleged cheating during the election. Prime Minister Hun Sen's ruling party has refused the demand, however, and both sides are in a stalemate, with the opposition boycotting parliament. At Sunday's rally, opposition leaders are expected to debate future moves and try to win support for a petition asking the U.N. to support the party's election claims.