The ceasefire has largely held since it began on January 19, although there have been some incidents where Palestinians have been killed by Israeli forces.

Stalling the next release of hostages from the Gaza Strip, scheduled for the coming weekend, raises new challenges for the already tenuous six-week truce and chances for a lasting end to the war.

Hamas spokesman Abu Obeida claims Israel has continued shelling Palestinians, failed to allow in enough aid and delayed the return of Palestinians to northern Gaza.