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Snapchat users were greeted with an alarming change to Snap Maps this morning: New York City had been renamed “Jewtropolis.”

Even worse,Prison Tres Speciale Pour Femmes social media was filled reports of maps on other websites and services with the same change, including Zillow, The Weather Channel, Citibike, and Streeteasy.

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The anti-Semitic vandalism made its way across the internet so quickly because all these websites and apps depend on a third party for their mapping data.

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Founded in 2010, Mapbox is a mapping and geolocation data startup that provides services to companies such as Foursquare, Evernote, and the previously mentioned sites and apps. To do this without the resources of a larger company like Google, Mapbox feeds its maps with data from a number of open data sources, including the crowdsourced OpenStreetMap.

OpenStreetMap is essentially Wikipedia in map form. With millions of users, OSM allows anyone to alter its map data, much like you can do on a Wiki. OSM users can add missing roads or new neighborhoods. They can even change the name of existing cities.

While its possible one of Mapbox’s other various data sources could have also been changed, the OpenStreetMap user page of the account responsible for the vandalism has archived the very changes that later showed up on the applications and websites using Mapbox.

Twenty days ago, user MedwedianPresident made a number of edits to OSM disguised as minor alterations to Auckland City Park and the City of London. Looking into the actual edits, however, shows what MedwedianPresident actually did. Stretches of New York were renamed the Ku Klux Klan Highway, Pedophile Bridge, Zionist Cannibal Drive, and the Adolf Hitler Memorial Tunnel. Sections of London were changed to Adolf Hitler Boulevard, Donald Trump Avenue, and Fuck Road.

The changes were caught pretty quickly on OpenStreetMap, with another user “reverting vandalism” and changing the names back. According to MedwedianPresident’s OSM page, an active block was placed on the account 19 days ago, a day following the vandalism. It’s unclear how the OSM info that was changed back weeks ago rolled out through Mapbox’s mapping data today.

Mashable reached out to the Anti-Defamation League after noticing that the ADL’s H.E.A.T. map, which tracks incidents of hate and anti-Semitism, was powered by Mapbox. A spokesperson told us that they do not believe its H.E.A.T. map was affected by this and forwarded us a Twitter statement on the issue as well as a tweet from its NY/NJ regional director.

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In an official statement provided to Mashable by Mapbox, it seems that the changes were in fact flagged by its AI technology, which “prevents malicious edits from entering the system from any third party data source.” However, human error caused the anti-Semitic edits to be pushed out live. Mapbox says they removed the edits within an hour.

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Mapbox did not confirm OpenStreetMap user MedwedianPresident was the culprit. Instead, it said it currently does not know where the edits came from -- it currently uses “over 130 sets of data” -- but says that it currently has security experts “working to determine the exact origin of this malicious hate speech.”