Militants in Afghanistan appear to have developed new, more sophisticated and more powerful roadside bombs.

Sky News gained access to underground bomb-making cells and seen first-hand how the militants seem to be creating more devastating ways to kill and injure international troops in the country.

Sky was shown a stockpile of bombs, primed and ready for use, while peace talks with the Taliban-led insurgency remain in their infancy.

At least 10 kilograms of explosives had been packed into a group of jerry cans. They each had their own black box with individual frequency codes plus an antenna.

But rather than using mobile phones to trigger the explosives - as so often done in the past - these bombs are detonated using a device similar to a radio scanner.

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