Israel has agreed to several temporary, humanitarian cease-fires but says it will not halt its fire before ending incessant rocket fire from Gaza and destroying Hamas' network of tunnels that have been used to infiltrate Israel and carry out attacks. Hamas wants its crossings with Israel and Egypt reopened, demanding detailed assurances that the flow of goods and people will be resumed. Israel says construction material that it has allowed into Gaza was used by Hamas not for building schools and homes but rather to construct tunnels. Israel already supplies Gaza with much of its power needs and though the Palestinians owe Israeli companies hundreds of millions of dollars for electricity, power and other services, this appears to be the area in which Israel would show the most flexibility and would not object to helping restore power. Hamas is demanding Israel release hundreds of Hamas prisoners it rounded up in its broad sweep of the West Bank last month during a search for three missing Israeli teens, whose bodies were found more than two weeks after they disappeared.