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Law enforcement sources tell Fox News Capitol police are investigating a suspicious package addressed to California Democrat Maxine Waters.
The package was discovered at a Capitol Hill mail screening facility in suburban Maryland.
So far, it's not known if the package is similar to explosive devices delivered to the residences of former Presidents Clinton and Obama and cnn.
Police are also investigating a packages delivered to Florida Democratic Congresswoman Debbie Wasserman Schultz.
In Washington, Jared Halpern, FOX News.
