For the millionth time civilians dying as a result of combat is not a war crime. The only issue here is not allowing ambulances into an area. That is not a problem, (it is well known that Hamas was using amulances which is a war crime) provided that the commander made some sort of alternative arrangements.
Mexico sentences five men to 697 years for killings of 11 women (AP)
from the article: What led to IDF bombing house full of civilians during Gaza war?