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The State Department is saying that there are still an undetermined number of Americans missing from the Brussels attacks.

Deputy Spokesman Mark Toner said on "Shepard Smith Reporting" that this is not atypical for a mass casualty event, but they're working hard to come up with a credible list of missing individuals.

At least four Americans are still missing, including couple Justin and Stephanie Shults and brother and sister Sascha and Alexander Pinczowski.

Toner said he knew of others but couldn't provide their names due to privacy laws.

Watch the interview above.

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