The United Kingdom, Canada and Australia have the legal authority, expertise and resources to exercise jurisdiction over atrocity crimes committed in Gaza. They can do so by exercising what is called universal jurisdiction, which allows states to investigate and prosecute international crimes – war crimes, crimes against humanity and genocide – even when committed abroad by foreigners against foreigners. In this instance, those killed include their own citizens. Their obligations and interest to pursue accountability are thus even more obvious. So, what should happen next? Canada, the UK and Australia should announce a joint criminal investigation into suspected war crimes committed in the WCK attack. They can also invite other states to join in. Poland, for example, also has the legal ability to exercise universal jurisdiction. Canada has already taken some steps in investigating war crimes in Palestine. In 2024, the Canadian police launched a “structural investigation” into international crimes committed in Gaza. This process collects evidence that can be used later in cases against perpetrators who enter Canadian jurisdiction.