Washington has a policy of informing all American citizens via such warnings when it updates security measures for its personnel in a country.
US President Joe Biden said on Wednesday Iran was threatening to launch a "significant attack in Israel," and that the US remained committed to its ally's security.
Asked about the security alert, State Department spokesperson Matthew Miller noted that Iran had been making public threats toward Israel.
"We conduct ongoing assessments all the time about the situation on the ground," Miller said at a press briefing. "I'm not going to speak to the specific assessments that led to us to restrict our employees' and family members' personal travel, but clearly we are monitoring the threat environment in the Middle East and specifically in Israel."
Published 12 April 2024, 01:28 IST