A group of armed men broke into the compound of the United Nations High Commissioner for Human Rights in Burundi's capital, Bujumbura, early Wednesday.
The incident occurred a week after a U.N. commission of inquiry reported possible crimes against humanity in Burundi, including extrajudicial executions, arbitrary arrests, torture, sexual violence and enforced disappearances.
The country has been in a state of political turmoil since President Pierre Nkurunziza ran for and won a controversial third term in 2015.
There was no immediate word on damage or casualties from the break-in.
The armed men forced their way into the U.N. compound after overpowering security officers, according to a reporter for VOA's Central Africa Service.
Elizabeth Throssell, a media officer for the U.N. human rights office in Geneva, described the incident as an "attack" on the Bujumbura office.
"It is being investigated and we are not in a position to give any more information until the investigation is complete," she said in a statement.
Speaking to VOA, police spokesman Pierre Nkurikiye said police had not received reports or a complaint about the incident.
Eloge Willy Kaneza contributed to this report.
