JOHANNESBURG—Uber Technologies Inc. on Monday asked police to protect drivers and passengers using its ride-sharing service from taxi drivers in South Africa's biggest city, who have lashed out at a company they say is cutting into their business.

"Recent intimidation...only underlines why people are increasingly choosing safe, reliable alternatives like Uber," the San Francisco-based company wrote on its website.

Several Uber users reported being harassed into taking metered taxis in Johannesburg's business district Sunday and Monday instead of the cars they had hailed via Uber's smartphone app.

"They said Uber as a non-African organization was taking a significant cut of the business away from locals," Roheid Ojageer, an analyst at a health-care nonprofit, said of the taxi drivers who coerced him to ride in one of their cars Sunday evening at three times the fare Uber charges.

Uberpop uses drivers without professional licenses, allowing it to offer lower prices.

Dozens of metered taxi drivers also protested Friday outside Uber's offices in Johannesburg, after city officials said they wanted Uber to comply with affirmative action legislation here meant to overcome decades of racial discrimination under white-minority rule.

Uber says many of its 2,000 drivers in South Africa come from groups discriminated against under apartheid. The company is also fighting a licensing dispute in Cape Town, where officials have impounded hundreds of its drivers' cars this year.

Alon Lits, Uber's general manager in Johannesburg, said most of its drivers in Johannesburg were still operating uninhibited. "There have been isolated incidences. It's not widespread," he said.

Opa Sikhosana, chairman of the Johannesburg Regional Metered Taxi Council, condemned the intimidation Uber passengers have experienced this week, but said he sympathized with his frustrated members.

Uber, he said, should operate under the same category of license they are subjected to, rather than the charter service categorization the government has assigned Uber drivers to date.

"They go to the extent of intimidating passengers because they want authorities to apply the law equally," he said.

The backlash in Johannesburg is the latest in a long string of battles Uber has fought with regulators and rivals from Portland to London to Beijing.

On Friday, the company suspended one of its most popular services, Uberpop, in France until a constitutional court ruling on the service's legality later this year.

Courts in Spain, Germany, Italy and the Netherlands have also banned Uberpop. Last month, Indonesian police said they were investigating Uber, and in May, authorities in the southern Chinese city of Guangzhou raided an Uber office.

Uber has amassed its $41 billion valuation by upending the heavily regulated taxi marketplace, expanding into 57 countries in six years. With its next round of funding targeting a $50 billion valuation, Uber could become the most valuable venture-backed startup in history. Only Facebook Inc. attained a $50 billion valuation before going public.

In South Africa, Uber users requested 2 million rides in the first half of this year, compared to 1 million in all of 2014, says Mwambu Wanendeya, Uber's communications director for Africa.

Drivers in Cape Town, Durban and Johannesburg cater to passengers with smartphones and a credit card, a level of affluence that excludes the millions of South Africans who rely on accident-prone minibuses known here as taxis to get around.

Those minibuses are operated by a network of powerful business owners with a history of solving disputes over routes and revenue through violence. But so far Uber had operated with little interference because the existing metered-taxi industry here is relatively small.

Now those metered taxi owners appear to be pushing back.

Mr. Ojageer, who was coerced late Sunday into taking a metered cab instead of the Uber ride he had hailed, said he would watch closely to see whether it seemed safe to try his smartphone app again.

"If there seems to be a lot of unrest I'd probably want to keep using the cab system as expensive as it is to avoid causing any more problems," he said.

Write to Patrick McGroarty at patrick.mcgroarty@wsj.com and Alexandra Wexler at alexandra.wexler@wsj.com

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