Sudanese President Omar Al-Bashir greets his supporters during a rally at a fair in Khartoum, Sudan. Monday 17 September, 2013. (Photo: AP)

Protesters burn tires and close the highway to northern cities (Photo: AP)

Protesters burn tires and close the highway to northern cities (Photo: AP)

A Sudanese man covers his mouth from heavy smoke after protesters burnt tires to close the highway to northern cities (Photo: AP)

Sudanese men look at the damage done to a police checkpoint office after protesters burnt it Tuesday night. (Photo: AP)

A Sudanese man looks at damage done to a police checkpoint office after protesters burnt it Tuesday night. (Photo: AP)

Sudanese protesters look at part of a palm tree they burnt to block a railroad track (Photo: AP)