Police and protesters have clashed for a fourth day in Sudan, where a government decision to cut back fuel subsidies sparked riots that have left 29 people dead.
Security forces fired tear gas Thursday at protesters in the capital, Khartoum, and in Port Sudan on the Red Sea. Some demonstrators called for President Omar al-Bashir's ouster.
The government's subsidy cut has caused a sharp rise in fuel prices and sparked public anger.
Sudanese security forces have been guarding key installations and gas stations, after rioters set buildings on fire and blocked roads.
Men pick through debris after rioters torched a fuel station in Khartoum, Sudan, Sept. 26, 2013.
A destroyed fuel tanker is left behind after rioters torched a gas station in Khartoum, Sudan, Sept. 26, 2013.
A man on a donkey cart passes burned buses following rioting and unrest in Khartoum, Sudan, Sept. 26, 2013.
Protesters burn tires and close the highway to northern cities amid a wave of unrest over the cutting of fuel subsidies by the Sudanese government, in Kadro, Sudan, Sept. 25, 2013.
A Sudanese man covers his mouth from heavy smoke in Kadro, Sudan, Sept. 25, 2013.
The escalating unrest has become one of the biggest challenges to Mr. Bashir's government since he seized power in 1989.
The protests began Monday after the government announced the fuel-subsidy suspension in a bid to help the economy. On Sunday, President Bashir said the subsidies had reached a level that is "dangerous" for Sudan's economy.
Sudan's fuel crisis began after South Sudan became independent in 2011. The new nation took over about three-quarters of Sudan's crude oil production.