Hezbollah , which operates in Lebanon and is caught up in other conflicts in the region , probably does not have the appetite to start a war with Israel . NEW : Palestinian security sources : Islamic Jihad fighters killed in Israeli airstrike . At least 100 Palestinians have been killed in Gaza since Monday , officials say . Medical sources compare the crisis in Gaza hospitals to that in Syria during its civil war . Israel says all options remain on the table , says that Hamas must stop attacking Israel .
NEW : Palestinian security sources : Islamic Jihad fighters killed in Israeli airstrike . At least 100 Palestinians have been killed in Gaza since Monday , officials say . Medical sources compare the crisis in Gaza hospitals to that in Syria during its civil war . Israel says all options remain on the table , says that Hamas must stop attacking Israel .