I saw that post to Mark. Still, I prefer to rely on better sources than Wikipedia for historical information. There are actually books on the subject. I believe one by Luciano Canforra, dedicated exclusively to the library, makes a strong case that the bulk of the destruction happened in the course of the Muslim conquest. Wikipedia may be a good place to begin researching, but is certainly not be relied upon by serious historians.
Knesset passes 'Norwegian Law' allowing ministers to resign their seats, remain in cabinet (Haaretz)
from the article: Waqf Temple Mount excavation raises archaeologists' protests