The US Federal Aviation Administration (FAA) is planning to impose a civil fine of $350,000 on e-commerce retailer Amazon for allegedly transporting dangerous goods by air, thereby violating hazardous materials regulations.

This proposal will be the largest fine imposed on the company.

The goods allegedly injured several UPS workers who carried the package.

According to the allegations of the FAA, the online retailer shipped in October 2014 a package that had a 1gal container of Amazing! Liquid Fire, which is a corrosive drain cleaner.

"We will continue to partner with the FAA in this area."

This drain cleaner was transported from Louisville Airport, Kentucky, to Boulder Airport, Colorado.

When the package leaked, nine UPS employees who handled the package felt a burning sensation, following which they were treated with a chemical wash.

According to the agency, the shipment was not properly packaged, did not carry a label, and the workers who handled it were not adequately trained.

Reuters quoted Amazon as stating: "We ship tens of millions of products every day and have developed sophisticated technologies to detect potential shipping hazards and use any defects as an opportunity for continuous improvement.

"We will continue to partner with the FAA in this area."