Commenter CCZ points to this article from NJ.com:

Stop blaming white people’ sign causes stir at N.J. post office

Updated Mar 3, 12:49 PM; Posted Mar 3, 4:05 AM

By Taylor Tiamoyo Harris tharris@njadvancemedia.com,

The United States Postal Service said it is investigating a racial sign put up outside its Flemington location.

USPS Postal Inspector Greg Kliemisch said Friday afternoon the sign, which read “March is national stop blaming white people month! Accept responsibility for your own bad choices. Hug a white person!,” was put up sometime Thursday. It was taken down in the afternoon by employees, he said.

… Flemington Councilwoman Betsy Driver chastised the sign on the “Flemington Forward” public Facebook group. Another resident had posted a photo of the sign on a private page, but later deleted the post, she said.

“The fact that somebody even put the sign up is just sad and not a reflection of our town,” Driver said.

“Racism is not a laughing matter.”