Israel's ground war option: "We are ready, we are prepared," says Israeli Ambassador to the U.S.

Day 6 now of the conflict between Israel and Gaza. Erin Burnett talks to Israel's ambassador to the U.S. Michael Oren about a possible ground invasion into Gaza.

Egypt's role in Israel-Gaza conflict

No slowdown in Gaza-Israel hostilities; U.N. chief arrives to push for cease-fire

Warplanes, drones and rockets criss-crossed the sky over Gaza for the sixth day Monday as Israel pressed its air offensive against Gaza militants. Hamas leader Khaled Meshaal vowed continued resistance against what he called a "criminal enemy."

"We do not want escalation nor do we call for a ground war," he told reporters at a news conference. "But we are not afraid of it nor will we back down."

In Israel, air raid sirens wailed throughout the day and troops shepherded residents into bomb shelters as rockets arced overhead. In Gaza City, rockets streaked away toward Israel as smoke and fire poured from buildings struck by Israeli warplanes or drones. Most businesses were closed, the streets largely empty.

At least two people died Monday afternoon in a strike on a Gaza City office building used by some media outlets, according to Palestinian sources. Ramez Harb, information leader of the military media office of Palestinian Islamic Jihad, died in the attack, the sources said. Among the wounded were two children, the sources said.

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