At least 45 killed at Al-Maghazi refugee camp
The Israeli military says it is looking into whether it was operating in the area at the time.
The overcrowded camp had people sheltering there as they fled bombardments further north.
People are searching through the rubble to find those missing, it’s believed more than 100 people were there at the time.
The head of Gaza’s Al-Aqsa hospital said 52 people were killed in the blast on Saturday night.