The 3D printer drone aimed at making refuges

A drone which can deliver 3D-printed concrete-like material to provide people with temporary refuge is being developed.

The Muppette project, from Gensler architects in Los Angeles, aims to explore how far the boundaries of current technology can be pushed.

The BBC's North America technology correspondent Richard Taylor spoke to Jared Shier, who is one of the founders of the project, and who has already begun assembling a prototype of the machine in action.

You can follow Richard on Twitter @RichTaylorBBC.