Burglary target marking using chalk signs is raising concern among law enforcement in Southern California. According to the San Marino Police Department, burglars have been scouting homes and marking them with symbols like an “X,” square, or circle to share information with others.
An “X” mark indicates a house that is easy to break into, police said. A square may suggest the presence of a security system or a dog. Although these markings may resemble graffiti or random doodles, investigators believe they are actually coded messages used by criminals to communicate.
So far, no burglaries have been officially linked to these symbols. However, police are urging residents to report any such signs immediately.
Markings Found in Visible, Public Areas

Authorities noted that the symbols are typically drawn with chalk in locations such as sidewalks, mailboxes, fences, driveways, and utility poles in front of homes.
In addition to the markings, law enforcement has observed increasingly sophisticated burglary tactics across Southern California. In more than five locations—including San Marino, West Hills, Encino, and Chino Hills—hidden cameras have been discovered, apparently placed to monitor homes before a break-in.
Police Advise on Preventative Measures
To deter potential burglars, police recommend installing motion-sensor lighting and security cameras. These devices can help detect suspicious activity and alert homeowners before a break-in occurs.
Officers stressed that community awareness is key. Residents are encouraged to stay alert, report unfamiliar markings or activity, and take proactive steps to secure their property.
BY HANKIL KANG [kang.hankil@koreadaily.com]