UN investigators found mounting evidence of crimes against humanity, including murder, torture and sexual violence, committed in Myanmar since last year's military coup.
The UN's Independent Investigative Mechanism for Myanmar IIMM said women and children were particularly targeted.
The investigators said there were ample indications that since the military takeover in February 2021, crimes have been committed in Myanmar on a scale and in a manner that constitutes a widespread and systematic attack against a civilian population.
Myanmar's military took power on February 1 last year, ousting the civilian government and arresting de facto leader Aung San Suu Kyi.
The junta has waged a bloody crackdown on the dissent, with more than 2,100 civilians dead and nearly 15,000 arrested, according to a local monitoring group.
The investigation team warned that over the 12 months to the end of June, the scope of potential international crimes in Myanmar has been broadened dramatically. The UN Human Rights Council established IIMM in September 2018 to collect evidence of the most serious international crimes and prepare files for criminal prosecution.
It cooperates with the International Court of Justice and the International Criminal Court.