Someone set down a bit of rubber on Denver’s LGBTQ pride crosswalk, and people are wondering if it was intentional.

In response, the city has installed a security camera.

The tire marks across the rainbow walkway at South Broadway and Irvington Street prompted a tweet from Alan Salazar, Mayor Michael Hancock’s chief of staff:

It’s “maybe completely innocent, who knows,” Salazar later told Denverite. But the city has received a few complaints about it, he said, so they’re going to fix up the damage and install the camera.

Rex Fuller, a spokesman for the GLBT Community Center of Colorado, hadn’t heard about the tire marks until we called to ask about it. He also expressed uncertainty about the intentions: “It goes across the street, so one would probably expect some tire marks on it.”