DETROIT (CBS DETROIT) – State historical markers are vanishing in the city. The discovery made while a group was on tour in the area of the stolen marker.

“I had a group of people who were doing a tour of black historic sites — near the former Hasting Street, which is now I-375 and I-75, and this was the first site we went to and we discovered that the marker was gone,” says Jamon Jordan with Black Scroll Network History and Tours.

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Jordan reported the latest stolen marker — while he was working with a group on tour at the William Webb home site on Congress at St. Antoine in downtown Detroit.

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“They got one,” he says, “but they didn’t get the other.”

Jordan speculating that it’s possible the thieves were scared off — possibly on the cusp of being discovered before removing another marker in the same location — one noting the first Jewish religious service.

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The state suspects this is the work of scrappers.