Vandals hit a fine art gallery on South Pearl Street in Denver on Thursday morning.
A witness told Denver7 she thought she heard two guns go off, but it was actually bricks that broke two windows at Gallery 1505.
The suspect or suspects drove off in a car.
Police have not yet said if anything was taken from the gallery.
Investigators are trying to determine if this is related to smash-and-grab burglaries at two restaurants at East 6th Avenue and Lincoln Street in Denver on Wednesday morning.