A man was forced to break the window of his BMW after his 3-year-old son was accidentally locked inside the vehicle on an expressway near Wuhan, capital of Hubei Province, last Thursday.

Traffic police rushed to the scene when they received reports of a man throwing stones at a luxury car parked on the roadside of the Huanghuang expressway.

The man told officers he had stepped out of his car to relieve himself and on returning to his car found the doors locked, with his son inside.

Traffic cops tried explaining the 3-year-old how to open the car's lock from inside, but failed, and eventually helped to break one of the windows.