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The attack happened along Ngong Road near a busy roundabout often manned by traffic police officers and well secured with security cameras.

Volunteers had manned paths over the weekend to stop people entering the danger zone leading to Glen Rosa, Goat Fell and Glen Sannox.

We passed by a checkpoint manned by the National Guard and the LAPD, then had to stop for 20 minutes on a narrow hillside road as a backhoe was unloaded from a flatbed truck.

Nearly every checkout lane once manned by a cashier is now closed, leaving a vast, eerie expanse of empty aisles where humans used to stand.

In August upmarket north of England supermarket chain Booths got rid of self-scan altogether, while Asda and Morrisons said they would put more staff back on manned tills.