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Protecting Baltimore from a nuclear attack. Homeland Security officials will conduct tests this week that could save lives and they’ll be done from a helicopter flying extremely low over the city.

Meghan McCorkell has more on the testing.

Officials will test for radiation so they can respond more quickly in case of a nuclear or dirty bomb attack.

Eyes to the sky will notice an unusual sight over Baltimore: a massive helicopter flying low overhead.

The chopper—a tool from the National Nuclear Security Administration—has sensors that test for naturally occurring radiation.

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