Blowing up buildings with people inside.

Or maybe that's a war. It's not automatically a war crime when a civilian dies. If it was, then 100% of all wars is "war crime", which makes the term meaningless.

The article has a very long list of alleged Israeli violations of international law and human rights. Here's a quick summary.

Genocide in Gaza. It is described as a "genocidal campaign" implying systematic targeting of a national, ethnic, or religious group, prohibited under the 1948 Genocide Convention. This is what the ICC is investigating now.

War Crimes:

- Killing of Palestinian civilians, including children and families.

- Killing of journalist Shireen Abu Akleh, a violation of the Geneva Conventions protecting civilians and journalists in conflict zones.

- Destruction of Palestinian homes in the occupied West Bank, possibly constituting collective punishment or unlawful destruction of property under the Fourth Geneva Convention.

- Intentionally starving civilians by blocking humanitarian aid into Gaza, explicitly prohibited under Article 54 of Additional Protocol I to the Geneva Conventions and cited in ICC arrest warrants for Israeli officials.

- Torture of Palestinian detainees by Israeli forces, a violation of the UN Convention Against Torture.

The article also alleges complicity from the US authorities and corporations (YouTube, Google, MailChimp).