An employee looks for items in one of the corridors at an Amazon warehouse. Amazon warehouse workers are suffering physical injuries and mental stress on the job as a result of the company's extreme focus on speed and pervasive surveillance, according to a new study. The data adds to a drumbeat of scrutiny around Amazon's workplace safety and treatment of warehouse employees. The researchers estimate Amazon is the largest warehouse employer in the country, accounting for an estimated 29% of workers in the industry. In June, a Senate committee led by Sen. Bernie Sanders, I-Vt., also launched a probe into Amazon's warehouse safety.

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Persons: they've, they're, Sen, Bernie Sanders Organizations: University of Illinois Chicago's Center, Urban Economic, Amazon, Regulators, Walmart, Occupational Safety, Health Administration, U.S, Attorney's, U.S . Department of Justice Locations: U.S