As Israel reeled from a deadly attack by Hamas militants who broke through barriers around Gaza and roamed at will, killing scores of civilians in Israeli towns, defense chiefs faced growing questions over how the disaster could have happened.

A day after the 50th anniversary of the start of the 1973 Yom Kippur war, when Israeli forces were caught off guard by Syrian and Egyptian tank columns, the military appeared once again to have been surprised by a sudden attack.

"It looks quite similar to what happened at that time," said retired Gen. Giora Eiland, a former head of Israel's National Security Council. "As we can see it, Israel was completely surprised, by a very well coordinated attack," he told a briefing with reporters.