Israelis watch Defence Minister Ehud Barak on television as they prepare to sleep in a bomb shelter in the southern town of Netivot November 14, 2012. Israel launched a major offensive against Palestinian militants in Gaza on Wednesday, killing the military commander of Hamas in an air strike and threatening an invasion of the enclave that the Islamist group vowed would "open the gates of hell". REUTERS/Nir Elias (ISRAEL - Tags: POLITICS CIVIL UNREST)