At least 36 people have been killed in two days of violent clashes between protesters and police across Yemen, police and witnesses say.
The riots broke out across the country on Wednesday
Tanks have been deployed on the streets of the capital, Saana.
Deaths were also reported in a string of other towns. The unrest began after fuel subsidies were lifted on Tuesday, leading to dramatic price rises.
The government says it needs to reduce the budget deficit, but opponents say the rises hit poor people the hardest.
Some eight demonstrators were killed on Thursday in the coastal city of Hudaydah, and two others were killed in the port of Aden, police officials told the Associated Press news agency.
In the northern city of Saada, at least two people were killed, reportedly members of the security forces. And there were reports that at least one person had been killed in clashes in Sanaa.
Other affected places included Marib, Dali, Taaz and Dhamar, police and medical officials told AP.
On Wednesday, clashes between rioters and security forces killed 13 people, including a 12-year-old child. They were killed as marchers took to the streets, attacking government buildings and throwing stones at police.
Prime Minister Abdul Qadir Bajammal has appealed for calm and called on people to "differentiate between freedom of expression and freedom of destruction".
Police are guarding official and government buildings
Yemen is one the poorest countries in the Arab world, and the government is implementing harsh economic reforms to address its heavy debts.
By lifting subsidies on fuel, the government has virtually doubled the price of petrol and significantly increased the price of diesel.
It says the rises will be offset by lower taxes and increased wages, but opposition parties say the move hits the poor, and are calling for a crackdown on corruption by officials.