Norway's Queen Sonja was taken to Rikshospitalet in Oslo on Monday evening with breathing difficulties.
"The Queen was transported by ambulance helicopter from Prinsehytten in Sikkilsdalen, where the royal couple has spent the Easter holiday", states the Norwegian royal house in a press release.
Prinsehytten is the royal family's mountain cabin in Jotunheimen.
Queen Sonja is 87 years old and King Harald 88 years old.
