A robot escaped from a science lab and caused a traffic jam in Perm, Russia.
Scientists at the Promobot laboratories had been teaching the machine how to move around independently, but it broke free after an engineer forgot to shut a gate.
The robot found its way to a nearby street, covering a distance of about 50m, before its battery ran out.
It stood in the middle of a busy road blocking traffic. It was guarded by a policeman for about 40 minutes until it was taken back to the lab.
The company says its machines can interact with humans, for example by answering questions and giving directions. But as the name Promobot suggests, its primary purpose seems to be broadcasting promotional audio messages via built-in loudspeakers.