British scientists have developed an "x-ray specs" radar that can peer through walls.
The machine can spot and track terrorists hiding in a building or seek out buried earthquake victims.
Gordon Oswald, associate director of Cambridge Consultants, the company behind the technology, said: "We have had lots of interest and are talking to a number of arms of government - this one and others."
A book-like sensor with a radar antennae linked to a computer transmits low frequency radar pulses that can pass through building materials 10ins thick.
Reflections from a detected object bounce back through the wall and are picked up by the machine's receiving sensors.
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