Karen Gullo:

The city of Portland, Oregon, sued to stop Uber Technologies Ltd. from operating three days after it started there, joining other cities including Rio de Janeiro and New Delhi where officials have moved this month to block the mobile car-booking company.
 Uber violates city laws because it and its drivers don’t have permits to operate, according to a complaint filed by Portland today in state court in Multnomah County. The complaint, a copy of which was provided by the city, couldn’t immediately be verified in court records.
 The service has grown rapidly since starting in San Francisco in 2010. It’s now available in more than 250 cities around the world and last week raised $1.2 billion in funding, increasing the company’s $17 billion valuation in June to $40 billion.