The US State Department has issued a travel warning for all of Jordan because of “threats from terrorist groups” after recent deadly attacks.
It said so-called Islamic State (IS) and its affiliates “continue to plot assaults” in the country.
More than a dozen people, including a Canadian tourist, have been killed in attacks in Jordan since last week.
The department also warned of similar threats to US citizens in Egypt, after a series of attacks there.
It advised avoiding travel to the Sinai Peninsula and the Western Desert regions.
In a statement on Friday, the department said that “terrorist and extremist organisations have expressed a desire to conduct attacks targeting US citizens and Westerners in Jordan”.
“Within the last year, Jordanian authorities have notified the US Embassy of several disrupted terrorist plots targeting US citizens and Westerners,” the travel warning added.
Jordan is seen by the US as a key regional player in battling IS fighters.