Negotiations between Israel and Hamas to implement a Gaza cease-fire and free the remaining Israelis held hostage there remained stalled Friday as the White House laid blame on the Palestinian militants.

Although Israel and Hamas have expressed optimism that progress was being made toward a deal, sticking points remain over the exchange of hostages for Palestinian prisoners and the withdrawal of Israeli troops from Gaza.

Hamas accused Israel of introducing new conditions while Israel's government said Hamas was reneging on agreements that had already been reached.