Perhaps some sort of EM-device or weapon. It is known from cases of encounters of people with UFOs (flying discs, or so called flying "saucers") that cars stop working when in vicinity of those flying objects. Devices on airplanes have been known to stop completely, i.e. they stop working (see the Tehran military UFO encounter, 1976); or car engines completely shut down; radio and other electronic devices start malfunctioning or completely stop working. So, assuming those real world flying objects are of some very advanced (possibly alien) origin (yes, alien, no matter how incredible that may sound--there's more than enough evidence accumulated over the past decades to support that theory), we could then very well imagine that Klaatu, since he is coming from a very advanced civilization, uses some sort of device (or devices) that achieves similar effects those objects achieve when they are in close proximity of our vehicles and electrical devices, only on a massive scale.
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