WASHINGTON (AP) — Amid online "chatter" about terror threats, U.S. diplomatic posts in 19 cities in the Muslim world will be closed at least through the end of this coming week.

State Department spokeswoman Jen Psaki says the decision to keep the embassies and consulates shuttered is a sign of an "abundance of caution" and is --quote -- "not an indication of a new threat."

Diplomatic facilities will remain closed in Egypt, Jordan, Libya, Yemen, Saudi Arabia and Kuwait, among other countries, through Saturday, Aug. 10. The State Department announcement Sunday added closures of four African sites, in Madagascar, Burundi, Rwanda and Mauritius to a list of almost two dozen closures announced Friday.

The U.S. has also decided to reopen some posts on Monday, including those in Kabul, Afghanistan, and Baghdad.

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