IPhone owners should beware picking up bad vibrations from powerful motorbikes, as they may damage camera systems, Apple has said.
The technology giant published a warning iPhones should not be attached to powerful bikes, in a support document spotted by MacRumors.
Engine vibrations can harm phones' optical-image stabilisation or closed-loop autofocus systems, it says.
Owners of scooters and mopeds should also use "vibration-dampening mounts".
On social media, several users have said their phones have been damaged after being attached to a motorcycle.
And Apple says several models of iPhone are susceptible to the damage.