According to the United Nations, at least 507 Palestinians have been killed, and more than 2,400 injured since Israel began its offensive in Gaza. A quarter of those killed are civilians.

Hospitals are at breaking point, families devastated, people are being forced from their homes.

Al Jazeera is the only international broadcaster with a presence in Gaza.

Sherine Tadros reports from the epicentre of Gaza's struggle to survive - its main hospital.