On Wednesday, the United Nations Office of the High Commissioner for Human Rights published a report alleging that Israeli forces carried out a mass execution of civilians in Northern Gaza, separating 11 men from their families and summarily shooting them.
When OHCHR drops a report like this it means they consider the allegations to be credible. It’s the same level as the news calling someone an alleged murderer after the guy killed someone on national TV. The report in this case is based on witness statements and an investigation done by a human rights NGO out of Europe.