When Islam appears in about 600 C.E. Those muslims who have converted, had custom to goes to pagan shrines and shout "shahada" or "Allahu akbar", and they consider it Martyrdom. Maybe this man converted or something.... Maybe this can help to autorithies in resolving this case....
Bomb in Lebanon targets bus heading to Syria, no casualties (Reuters)
from the article: Security guard shoots, kills Jewish Israeli man at Western Wall