Gaza crisis: BBC reports from Israeli staging post
Israel has said its forces are withdrawing from some areas of Gaza to a "temporary security strip" to reassess operations.
Earlier, senior Israeli officials said their target to destroy tunnels used by militants to infiltrate Israel was almost complete.
Gaza health officials say 30 people have died on Sunday, while militants continue to fire rockets into Israel.
The BBC's James Reynolds has visited an Israeli staging post outside Gaza, where tanks were lined up awaiting orders.