The US embassy in Beirut said on Friday that Iran and its aligned armed groups "may intend to target universities in Lebanon".
In a security alert, the embassy also urged US citizens to depart Lebanon "while commercial flight options remain available".
Lebanon was dragged into the conflict in the Middle East when Iran-backed Hezbollah shot rockets at Israel in retaliation to the killing of Iranian supreme leader Ali Khamenei at the beginning of the war.
Over the past 24 hours, Israeli strikes killed 23 people and wounded 98, the Lebanese health ministry said Friday.
The ministry said that the overall death toll includes 125 children and 91 women, since Israel launched intense airstrikes across Lebanon after the Hezbollah fired rockets toward northern Israel in solidarity with Iran on March 2. The strikes have also wounded 4,138 others.
Among those killed are 53 health workers, while Israeli strikes have targeted 83 emergency medical service facilities, the health ministry said.
