OutFront tonight - on the edge of war.
The Israeli military is preparing right now for a possible ground invasion into Gaza. Hundreds of Israeli troops have been moved to the Gaza border, and another 75,000 reservists are being called up to serve, as the killing and violence intensifies.
At least 28 people are reported to have been killed in Gaza and three in Israel since the rocket barrage began.
And today, Hamas unleashed its most provocative aerial offensive in decades, targeting Jerusalem with its rockets. Air raid sirens echoed through the streets as two rockets hit just south of the holy city that's always been considered off-limits, even by militants.
Hamas also firing several rockets at the coastal city of Tel Aviv in response to continued Israeli strikes. In this dangerous game of tit for tat, both sides are vowing to press ahead.
Outfront tonight to discuss the implications are Nick Burns, a former under-secretary of state for political affairs and ambassador to NATO, and Reva Bhalla, who works with the intelligence company Stratfor and a leading expert on the Middle East.