Israel's military has closed the front gates of Gaza's biggest hospital, preventing ambulances from entering or leaving the facility, where medical supplies and food are running low.

Thousands of people are stranded in Gaza's largest hospital amid Israeli bombardment.

Al-Shifa Hospital's director Muhammad Abu Salmiya described the area around the hospital as a battlefield, but said the hospital's staff has pledged to stay with patients until the last moment.

Aid agency "Doctors Without Borders" in a statement said it was extremely concerned about the safety of patients and medical staff at Al-Shifa hospital as the attacks at the hospital have been intensified.