Systems and methods to provide security to an occupant of a first vehicle. In an example method, a computer provided in the first vehicle establishes a geofence that surrounds the first vehicle. The computer may detect a second vehicle that is present inside the geofence at one or more times and may react to the detection by obtaining data that provides information about an identity of the second vehicle. In one scenario, the data may be obtained via vehicle-to-vehicle communication between the first vehicle and the second vehicle. The computer may evaluate the data to identify a driver of the second vehicle and to confirm that the second vehicle is carrying out a stalking operation and may pose a security threat. The computer may then automatically contact a police officer to report the security threat.