Why is Israel demanding control over 2 Gaza corridors in the cease-fire talks?

Israel's demand for lasting control over two strategic corridors in Gaza, which Hamas has long rejected, threatens to unravel cease-fire talks aimed at ending the 10-month-old war, freeing scores of hostages and preventing an even wider conflict.

Officials close to the negotiations have said Israel wants to maintain a military presence in a narrow buffer zone along the Gaza-Egypt border it calls the Philadelphi corridor and in an area it carved out that cuts off northern Gaza from the south, known as the Netzarim corridor.

It's unclear if Israeli control of these corridors is included in a U.S.-backed proposal that Secretary of State Antony Blinken has called on Hamas to accept to break an impasse in cease-fire talks. Blinken, who is back in the region this week, said Monday that Israel had agreed to the proposal without saying what it entails.

Israeli Prime Minister Benjamin Netanyahu says control of the Egyptian border area is needed to prevent Hamas from replenishing its arsenal through smuggling tunnels and that Israel needs a "mechanism" to prevent militants from returning to the north, which has been largely isolated since October.