WATCH: White House holds news briefing after Biden statement on Israel-Hamas fighting

White House press secretary Karine Jean-Pierre held a news briefing on Tuesday after President Joe Biden delivers remarks on the latest fighting between Israel and Hamas.

Watch the briefing in the player above.

Israeli warplanes hammered the Gaza Strip neighborhood by neighborhood on Tuesday, reducing buildings to rubble and sending people scrambling to find safety in the tiny, sealed-off territory as Israel vowed a retaliation for Hamas’ surprise weekend attack that would “reverberate … for generations.”

Aid organizations pleaded for the creation of humanitarian corridors to get aid into Gaza, warning that hospitals overwhelmed with wounded were running out of supplies. Israel has stopped entry of food, fuel and medicines into Gaza, and the sole remaining access from Egypt shut down Tuesday after airstrikes hit near the border crossing.

The war began after Hamas militants stormed into Israel on Saturday, bringing gunbattles to its streets for the first time in decades. More than 1,800 lives have already been claimed on both sides, and perhaps hundreds more. Hamas and other militant groups in Gaza hold more than 150 soldiers and civilians hostage, according to Israel.

The conflict is only expected to escalate. Israel expanded the mobilization of reservists to 360,000 on Tuesday, according to the country’s media. After days of fighting, Israel’s military said Tuesday morning that it had regained effective control over areas Hamas attacked in its south, and of the Gaza border.

A looming question is whether Israel will launch a ground offensive into Gaza — a 40 kilometer-long (25 mile-long) strip of land wedged among Israel, Egypt and the Mediterranean Sea that is home to 2.3 million people and has been governed by Hamas since 2007.

On Tuesday, a large part of Gaza City’s Rimal neighborhood was reduced to rubble after warplanes bombarded it for hours the night before. Residents found buildings torn in half or demolished to mounds of concrete and rebar. Cars were flattened and trees burned out on residential streets transformed into moonscapes.