The city of Rafah in the southern Gaza Strip appears to have suffered the heaviest bombardment since the break down of the latest ceasefire on Friday.
At least 35 people were killed in and around the area early on Saturday.
An ambulance at the Nasser Hospital in nearby Khan Yunis was attacked as it tried to reach wounded people inside Rafah.
Al Jazeera's Charles Stratford reports from Khan Yunis.
Source: Al Jazeera