The US embassy in Amman has warned that it has received credible information about potential attacks against upmarket shopping malls in the Jordanian capital.
The United States and other nations are increasingly jittery about the threat of "lone wolf" attacks carried out by radicalised people in their home country.
On Sunday, US homeland security chief Jeh Johnson warned shoppers in one of America's biggest malls, in the state of Minnesota, to be on guard after an Islamic militant group called for attacks on Western shopping centres.
The US embassy said it had "received information of a potential threat against high-end malls in Amman. The threat is judged to be credible, although the possible time frame and type of threat are unknown."
It said the Jordanian government had taken steps to increase security, but that embassy employees and their families had been instructed to avoid the locations "as a precaution in the coming days" and that private US citizens were advised to do the same.
Government spokesman Mohammad al-Momani said on Wednesday "Jordan continues to take security measures to ensure safety and security of people given the regional situation".
In a video, the al-Qaeda-linked Al-Shabab group also threatened Canada's massive West Edmonton Mall, London's famous Oxford Street and two malls in France: Le Forum des Halles and Les Quatre Temps.
Al-Shabab gunmen killed 67 people in an attack on a Nairobi mall in September 2013.
