White phosphoru is not a weapon of mass destruction and it is still allowed for use in combat today worldwide albeit in very milited situations. Israel was roundly critisized for using it in Gaza and shortly after stopped using in areas with dense civil populations. It was not used in Lebanon.
Israeli soldier lightly wounded after being hit by car south of Hebron (Haaretz)
from the article: Obama: U.S. unprepared to rush into Syria intervention