The Pakistan Cricket Board has asked discarded wicketkeeper-batsman Zulqarnain Haider to present evidence to back up his corruption allegations against Kamran Akmal and other unnamed players by August 31 or face disciplinary action. PCB`s Chief Operating Officer Subhan Ahmed told the media that the Board had taken serious notice of the latest outburst by Haider on his facebook page and in media interviews. "We have taken serious notice of his latest allegations because when he was pardoned by us he had assured us he would be on his best behaviour," Ahmed said. "We have sent him a letter asking him to provide our anti-corruption officers the evidence or details he has to back up the allegations he has made against other players," he added. Haider, in his latest outburst, questioned the selection of Kamran in the national team for the coming series against Australia and the Twenty20 World Cup. He claimed that Kamran had not been cleared by the International Cricket Council and the PCB had selected him despite suspicions about his behaviour. Haider threatened to make more startling revelations about other players in the team if Kamran didn’t produce the clearance certificate given to him by the ICC. "He has to now substantiate his allegations because his statements are damaging for Pakistan cricket and the other players and this can’t carry on. We will wait and see what he has to say or comes up with on the 31st," the PCB official said. Haider, who made his Test debut in England in 2010, was fined just Rs500,000 and pardoned by the board after he had fled the team hotel in November 2010 in Dubai and flown to England seeking political asylum. Haider claimed he had left the team hotel during the series against South Africa as he was under threat from bookmakers who wanted him to do spot fixing in the one-day series. He later retracted his statement and returned home to a pardon.