GETTY ISIS have already launch devastating explosive attacks

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The claim comes from a veteran German journalist who is the only reporter to have been allowed to operate as an ‘embed’ with ISIS and escape alive. Jürgen Todenhöfer, 75, a former MP with Angela Merkel's CDU party, became a reporter in 2000 and has specialized in war reporting. He spent 10 harrowing days on the ISIS frontline, dodging bullets and death threats, while being chauffeured around by none other than the UK’s own scumbag traitor 'Jihadi John' – real name Mohammed Emwazi.

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Todenhöfer’s conclusions – detailed in a book called 'Inside IS - Ten Days In The Islamic State' - make chilling reading. He believes the west cannot militarily defeat the self-styled Caliphate rulers and writes: “The terrorists plan on killing several hundred million people. "The west is drastically underestimating the power of ISIS."

My family didn't hear from us for seven days. It was very difficult for my daughters Journalist Jürgen Todenhöfer

Shockingly, he even compares them to a "nuclear tsunami preparing the largest religious cleansing in history." Critics say Todenhöfer, 75, was only allowed to get so close to ISIS because of his reputation as a vociferous critic of U.S. policy in Iraq and Afghanistan. But he said: "This project was opposed by my family for seven months. "My son ultimately accompanied me - against my will. He meant to protect me. And he filmed there."

GETTY ISIS have suffered significant loses in recent months but the group still control a huge area

He managed to make contact with his family only once, from an Internet cafe on the third day following their arrival, but their mobile phones were taken from them by their hosts. He said” "My family didn't hear from us for seven days. It was very difficult for my daughters." Todenhöfer added the trip came about after intense negotiations with "the leadership of the Caliphate, via Skype, over several months, hammering out the security details." He made his will before leaving and said: "Of course I'd seen the terrible, brutal beheading videos and it was of course after seeing this in the last few months that caused me the greatest concern in my negotiations to ensure how I can avoid this. Anyway, I made my will before I left. "People there live in shellholes, in barracks, in bombed-out houses. I slept on the floor, if I was lucky on a plastic mattress. I had a suitcase and a backpack, a sleeping bag.