A group of senators, including Sen. Sherrod Brown Sherrod Campbell BrownEmboldened Democrats haggle over 2021 agenda Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-Ohio) and 2020 Democratic presidential candidate Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.), pressed Amazon in a letter on Monday over the higher-than-industry-average injury rates in its U.S. warehouses, pushing the company to take "concrete actions" to ensure its facilities are as safe as possible.

Citing recent reports from a union-backed advocacy group and the Center For Investigative Reporting, the senators accused Amazon of placing profit over worker safety. The letter emerges amid reignited scrutiny of how Amazon treats its hundreds of thousands of employees, some of whom have gone public with personal anecdotes that blame Amazon for encouraging them to work until they injured themselves.

"Amazon’s dismal safety record indicates a greater concern for profits than for your own workers’ safety and health,” Sanders, Brown and Sen. Tammy Baldwin Tammy Suzanne BaldwinKeep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser Democrats seek balance in backing protests, condemning violence MORE (D-Wis.) wrote. “We urge you to overhaul this profit-at-all costs culture at your company and take the immediate steps identified in this letter to ensure Amazon’s managers treat your workers fairly and do not require them to risk their own health and safety in the course of doing their jobs."

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The Center for Investigative Reporting reported that the rate of "serious" injuries for 23 of Amazon's fulfillment centers across the U.S. was more than double the national average for warehouse employees.

Amazon says some of the allegations are based on faulty math. The company says it "over-reports" employee injuries, meaning its injury rates look higher than average only because many other companies do not report the bulk of injuries they come across. Amazon reports any injury that can't be addressed by first aid, the tech behemoth said on Monday.

And it noted that around 70 percent of all injuries reported are strains, pulled muscles, stiffness or soreness.

Twelve Democratic senators, including 2020 Democratic presidential candidate Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.), signed on to the letter alongside Sanders, Brown and Baldwin.

"We urge you to take immediate steps to protect your employees from workplace injuries. Your employees’ lives and well-being depend upon your swift action," the senators wrote.

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They laid out a set of proposals around how Amazon should tackle the rising number of workplace injuries, some of which Amazon already does and some that would mark a significant change for the company.

For example, the senators suggested that Amazon "reduce workers’ quotas and speed requirements" and ensure its on-site medical representatives are licensed professionals.

The senators also called called for a "comprehensive ergonomic evaluation of all warehouse tasks." The company said it has already employed many ergonomic experts to observe and update how workers are advised to move on the job.

The senators asked for a written response by Feb. 21.

Labor activists and lawmakers have long criticized Amazon over its bruising working conditions, pointing to reports that found Amazon warehouse workers were treated like robots, were forced to urinate in bottles in order to save time and lived in fear of harsh treatment by managers. Multiple Amazon workers have spoken up on the issue, with some groups of employees pushing to unionize. Amazon has disputed those charges.

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Amazon has insisted it is investing enormous sums of money and manpower into ensuring its warehouses are safe for all of its workers.

Updated 8:49 P.M.