CHATTANOOGA, TN. (Times Free Press) -- Sign after sign appeared on the walls of The Johnson Group building on Market Street last weekend.

Gang graffiti was spray-painted in black on the white walls.

"Once they start tagging your building, they continue it and it takes hours to get off," said Sandy Allison, owner of the building. "We've been hit a few times. Never like that, though."

Some police officers on the street say they are seeing an increase in the amount of graffiti on buildings in Chattanooga.

Read more on the story from our news partners at the Chattanooga Times Free Press.