This is the main basis! "failed to take feasible precautions required by international law to avoid or minimize loss of civilian life, injury to civilians and damage to civilian objects." This is israel obligation, emails, text messages, preemtive strike notices were not enough. What were Hamas precautions. The world is laughing at the report!
Swedish police arrest man in Stockholm area on suspicion of preparing terror crimes (AP)
from the article: U.S. to Israel: Probe alleged Gaza war crimes to advance peace