Pentagon is investigating an online threat allegedly made by Islamic State (ISIS) to about 100 of the US military personnel.
A list of names and addresses was posted on a website linked to ISIS alongside a call for them to be killed.
It said the personnel named had participated in US missions against ISIS.
The group urged its supporters in the US to “take the final step” and “deal with” those named.
A US defense official, speaking on condition of anonymity, said: “I can’t confirm the validity of the information, but we are looking into it.”
The US and its allies have been conducting air strikes against ISIS militants in Syria and Iraq since last September.