Many Kenyans fear that Tuesday's fiercely contested general election will trigger ethnic violence between supporters of rival parties, writes the BBC's Dickens Olewe from the capital, Nairobi.

Soap, long-life milk, maize flour and cooking oil are flying off the shelves of supermarkets in Nairobi as people stock up on foodstuff and other essential items amid fears that violent protests will break out once the result is announced.