 The brief travel advisory by the U.S. Embassy in Beirut says the security environment in Lebanon remains complex and can change quickly. It urged U.S. citizens not to travel to southern Lebanon, the Lebanon-Syria border region, or to refugee settlements. Israel and Hezbollah have exchanged almost daily cross-border fires since October 7 when Hamas militants launched an attack on Israel. The U.S. has been trying to ensure the fighting in the north doesn't erupt into a broader regional conflict.