At least 40 people were killed and 60 wounded, local news agency WAFA said, in an Israeli strike early Tuesday that left craters up to 10 meters (32 feet) deep in a humanitarian area of the Gaza Strip.
Details about the strike in the Mawasi coastal community just west of Khan Younis, which the Israeli military has designated as a humanitarian safe zone, were not yet clear.
The area is home to many Palestinians displaced by Israel's devastating war on Gaza.
Footage circulating on social media showed deep craters at the site of the attack, the strewn ruins around it covered in shredded tents and other debris.
Rescue workers used shovels to shift through the sand. Bystanders used their hands to dig, illuminated by mobile phone light. At least one crater at the site looked to be as deep as 10 meters (32 feet).