Amazon has paid a $91,000 civil penalty for improperly shipping a package with flammable liquid adhesive, the Federal Aviation Administration announced, according to Business Insider.

The liquid adhesive is a hazardous material under US DOT regulations.

The tech giant's employees "offered the shipment without the requisite shipping papers or emergency response information, and did not mark, label, or properly package the shipment," according to the FAA.

Amazon "failed to properly train its employees" for this kind of shipment, the FAA said.

The shipment was on a FedEx flight from Whitestown, Ind. to Boulder, Colo., on September 16, 2013. A gallon container of the adhesive was found leaking in Boulder. The $91,000 goes to the U.S. Treasury.