A State Department travel advisory that was updated Friday said U.S. government personnel in the country must stay in their homes and "avoid unnecessary travel between sundown and sunrise."
Nicaragua has been rocked by protests and a violent crackdown by authorities since April, when demonstrations began demanding President Daniel Ortega's exit from office. Ortega's government has likened such demands to an attempted coup. A report last month from a team of independent investigators said at least 212 people have been killed in clashes.
Talks aimed at resolving the crisis have repeatedly broken down.