JERUSALEM - Israel vowed on Monday to raze every single Hamas structure in the Gaza Strip during its ongoing blitz of the Palestinian enclave ruled by the Islamist movement.

"After this operation there will not be a single Hamas building left standing in Gaza, and we plan to change the rules of the game," said armed forces deputy chief of staff Brigadier General Dan Harel, quoted by YNet News.

"We are hitting not only terrorists and launchers, but also the whole Hamas government and all its wings," Harel told leaders of Israeli communities that are within range of the rockets fired by Gaza militants.

"We are hitting government buildings, production factories, security wings and more," he said.

At least 320 Palestinians were killed in three days of air strikes on targets in the besieged Palestinian enclave. Two Israelis were killed by rocket fire from Gaza in the same period.

Harel warned that was just the beginning. "The worst is not behind us, it is still ahead of us," he said ominously.