Mozambican mobile phone users found on Monday they could not send text messages, technology that has been used to call for protests in this impoverished country over increases in food, water and electricity prices.
Protests last week in the capital, Maputo, turned violent, with at least 10 people killed in clashes with police.
Maputo was calm over the weekend and early on Monday, though many workers and students stayed home for fear of more violence. Police reported finding a few burning tyres blocking streets, but no protesters at the barricades.
It was not immediately clear whether the interruption in mobile phone messaging was part of a government crackdown.
Also on Monday, state radio reported nine people have been arrested, accused of incitement for sending mobile phone messages calling for protests.
The radio report said six were arrested on Sunday and another three on Monday in Nampula for trying to spread the protests to that northern province. Nampula has so far seen no unrest.
No one has claimed responsibility for organising the protests sparked by rises in the government-set price of bread, water and electricity.
Authorities have said they were trying to trace who sent the first unsigned mobile phone messages calling for protests in the southern African nation. Over the weekend, text messages calling for calm and portraying protests as unpatriotic began to appear - they, too, were unsigned.
Protesters on the streets have said even they do not know who is orchestrating the demonstrations, and that they believe those behind them want to remain anonymous for fear of arrest.
In an Associated Press interview over the weekend, Afonso Dhlakama, leader of the main opposition Renamo party, told the AP his party was not responsible for the protests. But he and other opposition leaders have tried to gain political mileage from them.
Dhlakama accused the police of using excessive force, and said the rioters' demands were understandable. He noted that many of those who took to the streets were young.
"The children feel the pain of their fathers, who cannot afford to pay fees for schooling," he said.
Daviz Simango, another opposition leader, also has called on the government to meet protesters' demands. A third opposition figure, Jose Manuel Campira, on Monday called for more demonstrations - but said they should be peaceful.
The government has said it will remain firm on the higher prices. It has said keeping food prices low is difficult because so much of the country's food has to be imported. Mozambique grows only 30 per cent of the wheat it needs.
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