What to know

• Tens of thousands of Palestinians live in an estimated 2,000 damaged buildings across GazaS1
• The search for survivors has been hampered by Israeli restrictions on heavy machinery in the Gaza Strip. Authorities say 2,000 damaged buildings in the territory are occupied by families who have nowhere else to go.S2
• At least 21 people, including 11 children, have died and dozens more are missing after an apartment building collapsed in Gaza from damage sustained in earlier Israeli strikes.S3