Alphabet, Google’s parent company, also owns Waymo, a technology company that manufactures driverless cars. Waymo has been testing its product in Arizona over the past few years to the chagrin of some of Arizona’s residents.

Some Arizonans have reportedly been caught attacking the driverless cars by: throwing rocks, attempting to run the cars off the road, and even brandishing firearms against the cars.

According to The New York Times, anti-self-driving vehicle civilians deem the driverless cars to be dangerous, both physically and economically. In addition to fearing fatal car crashes, driverless car opponents are also concerned about the amount of jobs that potentially can be loss due to the cars’ existence.