The UN faces “very challenging times” and needs to embark on a new mission “to change and to reform and to improve.”

That’s the message delivered to staff by new UN chief, António Guterres, on his first day at UN Headquarters in New York.

The former Portuguese Prime Minister and UN High Commissioner for Refugees began his five-year term at the helm of the organization on January 1.

More details from Matthew Wells.

Duration: 2'26"