Leader of the Botswana's main opposition party, the Umbrella for Democratic Change, Duma Boko, has cast doubt on the credibility of the elections to be held on Wednesday. Boko says the opposition is being harassed by the intelligence services, making it difficult for it to campaign around the country. Over 920 000 Batswana will vote tomorrow* in what is believed to be the fiercely contested elections in the history of Botswana.