(CNN) - A photo silhouette posted to Anthony Weiner's campaign website sparked conversation online Thursday.
But it wasn't a photo of the former congressman, who is running to be mayor of New York, but instead the skyline at the top of his bare-boned website's homepage.
Several visitors to the site noticed the skyline image looked more like Pittsburgh than New York, and some posted pictures of the Pennsylvania city's skyline to illustrate the similarity.
The site went live around the time of Weiner's late-night announcement on Wednesday. By Thursday evening, it had been replaced with a montage of New York sights.
The marketing firm behind Weiner's website, NGP VAN, released a statement: "the image of the wrong skyline on the placeholder page for the Weiner campaign was our honest mistake, and not that of the Weiner campaign."
"This is our fault," said John Brougher, a vice president at the firm.
Their designer "got the image from a set of images that included New York City images, but obviously this image was not of New York City, as the Weiner campaign had requested. With the image behind a strong blue background, our team did not catch this mistake. The offending image has been replaced, and the placeholder page now uses a New York City image; as will the full website when it launches."
– CNN's Paul Steinhauser and Gregory Wallace contributed to this report