A new sign at the entrance to the NIH campus in Bethesda, Maryland, tells visitors they must state their citizenship to gain entry. (Ricky Carioti/ Washington Post)

A new sign at the entrance to the NIH campus in Bethesda, Maryland, tells visitors they must state their citizenship to gain entry. (Ricky Carioti/ Washington Post)

National Institutes of Health tightens security

All visitors — including patients — must disclose their citizenship as a condition of entry.

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