The World Health Organization has suspended medical evacuations from Gaza to Egypt after a “security incident” in which a contract worker was killed, an episode Israel said Tuesday involved its soldiers opening fire in response to “an immediate threat.”

WHO chief Tedros Adhanom Ghebreyesus on X late Monday wrote that the U.N. health agency was "devastated to confirm that a person contracted to provide services to the organisation in Gaza was killed today during a security incident."

Two staff members who were also present were not injured, he added.

WHO did not elaborate, but said the incident was "under investigation by the relevant authorities."

Israel's mission in Geneva, meanwhile, posted on X Tuesday that a day earlier in southern Gaza, "IDF troops identified an unmarked vehicle approaching them and posing an immediate threat," it said, stressing that "troops fired warning shots" in response.