Over the past six months, the Transportation Security Administration ramped up civil citations to passengers, mostly aboard airplanes, who refused to comply with mask mandates, slapping them with more than $640,000 in proposed fines, according to a government report released Monday.

It was a stark increase compared with a six-month period from February to September of last year, when the TSA issued more than 2,000 warnings and fined just 10 passengers a total of $2,350, according to a news release in October.

In total, between Feb. 2, 2021, and March 7, 2022, the agency fined 922 people for violating mask mandates and issued 2,709 warnings, the report, by the Government Accountability Office, said.

More on the COVID-19 pandemic

The wearing of masks to stop the spread of the coronavirus became a cultural flashpoint during the early months of the pandemic and has continued to be polarizing.

Last week the Biden administration extended the mask mandate for air travel and public transportation to April 18, while the Centers for Disease Control and Prevention reviews the policy to see if it is still necessary.

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Both the TSA and the Federal Aviation Administration investigate incidents in which people do not comply with mask mandates. The TSA’s authority is not limited to air travel, but covers airports and other modes of public transportation. During 2021, the FAA proposed more than $5 million in fines for unruly airplane passengers; most of the incidents were mask related.

R. Carter Langston, a spokesperson for the TSA, said the process for reporting incidents became better understood in the past six months, which is why the citations and penalties increased so significantly.

In late October, the chairman of the House Homeland Security Committee, Rep. Bennie Thompson, D-Miss., urged the TSA to enforce more penalties.

The report did not include any recommendations for the agency.