Israel's military intensified its assault on Hamas militants in Gaza, as the United States and other global powers called for aid to continue flowing into the besieged strip to prevent an already grave humanitarian crisis from worsening.

Israel's military said it had hit more than 400 militant targets in Gaza overnight and killed dozens of Hamas fighters, including three deputy battalion commanders.

In a statement, the military said that among the targets hit was a tunnel which allowed Hamas to infiltrate Israel from the sea and Hamas command centers in mosques. Reuters could not immediately verify the report.