One staff member was arrested after the agency referred three workers at the Kakuma camp to Kenyan police for criminal prosecution, according to the UN's High Commissioner for Refugees (UNHCR).
"Protecting lives is at the core of UNHCR's work, which makes the betrayal of trust we have seen in this case so galling," said deputy head of the UNHCR George Okoth-Obbo yesterday.
The UNHCR launched an internal investigation after receiving allegations of fraud, corruption, threats and intimidation in the camp, it said.
The agency also suspended restettlement applications for the camp, it said.
UNHCR investigations are carried out by the organisation's Inspector General's Office, an independent body which reports directly to the High Commissioner.