A group of Democratic lawmakers are demanding more answers from Amazon about its contracts to provide law enforcement agencies with facial recognition technology.

The group sent a letter to Amazon CEO Jeff Bezos on Thursday saying that the company’s previous explanations to Congress about its Rekognition software were inadequate. Democratic lawmakers expressed concern about the potential threat the technology poses to civil liberties in the hands of police.

“Facial recognition technology may one day serve as a useful tool for law enforcement officials working to protect the American public and keep us safe,” the letter reads. “However, at this time, we have serious concerns that this type of product has significant accuracy issues, places disproportionate burdens on communities of color, and could stifle Americans’ willingness to exercise their First Amendment rights in public.”

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Among those who signed the letter were Sen. Ed Markey Edward (Ed) John Markey3 reasons why Biden is misreading the politics of court packing Democrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement MORE (D-Mass.), Rep. John Lewis John LewisTrump to pay respects to Ginsburg at Supreme Court Democrats urge Biden to resist filibuster, court-packing calls Rep. Bill Pascrell named chair of House oversight panel MORE (D-Ga.) and Rep Jimmy Gomez Jimmy GomezDemocrats call for IRS to review tax-exempt status of NRA Trump says no Post Office funding means Democrats 'can't have universal mail-in voting' Hispanic Caucus asks for Department of Labor meeting on COVID in meatpacking plants MORE (D-Calif.).

An Amazon spokeswoman did not immediately respond when asked for comment.

The lawmakers wrote to Amazon in July about their concerns of the accuracy of Rekognition and its potential impact on people of color.

Amazon said in response that its technology had been rigorously tested and refused to provide any information on its law enforcement clients.

“Customer trust, privacy, and security are our top priorities at AWS,” Michael Punke, Amazon’s vice president for global public policy, wrote in response. “We have long been committed to working with federal and state legislatures to modernize outdated laws to enhance the privacy and security of our customers by preventing law enforcement from accessing data without a warrant.”

In the letter on Thursday, the Democratic members requested that Amazon provide them with results from accuracy tests of the Rekognition software. They also asked again for information on their government clients and if they audited law enforcement’s use of facial recognition to ensure that its not being employed in violation of civil rights law.

They asked that Amazon respond to their queries by December 13.