$3.6 million in U.S. counterfeit currency was seized by American customs agents Friday at the Pembina Port of Entry in North Dakota.

According to U.S. Customs and Border Protection (CBP), officers working commercial cargo that day targeted a shipment described as toy guns. Upon inspection, nine toy guns were discovered along with 36,000 $100 bills which turned out to be fake. The agency says the seized counterfeit money will be destroyed.

“Our officers work extremely hard to protect the United States from a variety of threats,” said Pembina Area Port Director Jason Schmelz in a news release. “Working with other federal partners, CBP officers were able to keep this counterfeit currency from entering into the economy. To have such a significant seizure on the 19th anniversary of 9/11, shows the commitment all of our officers have, not only today, but every single day they come to work in order to keep our country safe from all threats.”

The agency says stopping the flow of illicit goods is a priority trade issue, adding the importation of counterfeit merchandise including counterfeit currency can damage the U.S. economy.