Harare – Zimbabwe's former vice president Joice Mujuru has accused President Robert Mugabe of being the main driver of corruption in the country, adding that he should account for the missing $15bn in diamond revenue, a report has said.According to New Zimbabwe, Mujuru claimed that Mugabe, together with former mines minister Obert Mpofu, were the best people to account for the missing $15bn in diamond revenue. Speaking at the maiden rally of her newly formed Zimbabwe People First (ZIMPF) party in Mutare over the weekend, Mujuru said that her name had been dragged through the mud by Mugabe and his cronies. She claimed that she had never signed any deals with major foreign investors in the Chiadzwa mining fields. Mujuru said that Mugabe and Mpofu knew that she was never involved in signing any private investments deals in the Maringe diamond fields."It's about time president Mugabe conceded that he has failed and call for early polls to pave way for those with fresh ideas to turn around the fortunes of the economy and avert further suffering of the people," Mujuru was quoted as saying.In a shocking interview after his birthday celebration in February, Mugabe revealed that diamonds worth at least $15bn were looted in the eastern mining area of Marange.Mugabe, at the time, said that the state treasury received less than $2bn in revenue. Mugabe's revelation prompted the country's opposition parties to call for a thorough investigation into the disappearance of the diamonds. Following the revelations, Mugabe's government said recently that it had launched a forensic audit of at least seven firms that operated in the Chiadzwa diamond field.