Oslo- Norwegian Crown Princess Mette-Marit has sustained a minor concussion after falling down some stairs during a visit to Ukraine, reports said Monday.

The crown princess was in Ukraine in her capacity as a goodwill ambassador for the joint United Nations programme, UNAIDS, the Norwegian news agency NTB reported.

She apparently fell during a visit to a support group for people living with HIV-Aids, NTB added.

A physician has ordered the 35-year-old princess to rest for the next two days. The three-day visit was scheduled to end Wednesday. (dpa)