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Attacks like the one in London are 'incredibly difficult to stop,' analyst says

NBC senior national security analyst Juan Zarate says the London terror attack is part of a "new wave" of low-tech but high-impact incidents. He notes to Sunday TODAY's Willie Geist that despite the high alert from officials looking to disrupt attacks, they weren't able to stop this one before it happened.
/ Source: TODAY

NBC senior national security analyst Juan Zarate says the London terror attack is part of a “new wave” of low-tech but high-impact incidents. He notes to Sunday TODAY’s Willie Geist that despite the high alert from officials looking to disrupt attacks, they weren’t able to stop this one before it happened.