A late-night fire that sent crews to San Francisco's tony Maiden Lane was arson, officials said Tuesday morning.

According to the San Francisco Police Department, it was 11:40 p.m. Monday when they were called to Maiden Lane, a short, pedestrian-only alley "notable for its proximity to Union Square and its concentration of upscale retailers, including Chanel, Marc Jacobs, and Yves Saint Laurent," its website says.

When officers arrived, they discovered that "multiple trash cans" in the alley "were on fire," police say. The San Francisco Fire Department was subsequently called to the scene to extinguish the blazes, which they did without any injuries or serious damage to the area.

Once the flames were quelled, fire investigators determined that the blazes were "arson related," police say. However, according to the SFPD there were no witnesses to the start of the incident, and no suspect information to be had...so as of Tuesday, the Maiden Lane firebug remains at large.