Zimbabwe has shut down the internet indefinitely amid an intensifying crackdown on protests against a hike in fuel prices.
The country's largest mobile operator - Econet - says it has been ordered to cut services until further notice.
Access to Facebook, WhatsApp and Twitter has been intermittently blocked since protests broke out on Monday.
At least three people have been killed and 600 people have been arrested.
The UN has called on the government to halt the "excessive use of force" by security forces including firing live ammunition, and allegations of night-time door-to-door searches and beatings.
"Doctors' associations say more than 60 people were treated in hospital for gunshot wounds, this is not way to react to the expression of economic grievances by the population," Reuters news agency quotes UN human rights spokesperson Ravina Shamdasani as saying.
The government has blamed the opposition and political rights groups for the protests.
Why has the fuel price increased?
President Emmerson Mnangagwa said the rise was aimed at tackling shortages caused by an increase in fuel use and "rampant" illegal trading.
But move has angered many who feel the president, who is on a tour of Russia and Asian countries this week, is failing to live up to his promises following his election last year in disputed polls.
Riot police have been clashing with protesters in the capital, Harare, and the southern city of Bulawayo after they lit fires and blocked roads using rocks. Some businesses and schools in the two cities have been closed during the protests.
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