They're not just altering checks taken from the blue boxes, police said they're also using victims' identities to access and steal money from their bank accounts.
USPS also reported there were 113 dog bites or dog attacks in Kentucky.
The suspects threw the carrier to the ground, showed a gun, and took the postal keys.
Dog attacks are on the rise in Louisville and letter carriers are often the target.
The U.S. Postal Service released its dog bite national rankings in May.
Police said USPS has issued a warning and the community needs to stay informedĀ and vigilant.
Get those gifts in the mail soon! The deadline to get them delivered in time for Christmas is approaching.
It's only September, but the United States Postal Service is already looking ahead to the holiday season.
USPS said the new option is "simple, reliable and more affordable."
The postal worker told police he noticed a black Dodge Charger park near the mail box building. He said while putting mail away, a male pointed a gun at him.