The 98-year-old has been taken to the hospital as a precaution for the treatment of an existing condition.
The Duke of Edinburgh has been admitted to the King Edward VII Hospital in London where he will remain under observation for a few days.
Prince Phillip is said to have walked into the hospital unaided and sources say this is part of a planned visit rather than a sudden admission.
This comes as the Queen arrived at Sandringham, where members of the royal family gather for Christmas every year.
Iran-linked hackers breach FBI director's personal email
Trump extends deadline for striking Iran's energy plants to April 7
Israeli evacuation orders uproot 370,000 children in Lebanon, UN says
UN rights chief urges US to conclude probe into deadly Iran school strike
No injuries reported as Kuwait Shuwaikh Port comes under drone attack
IRGC-linked cells targeting Bahrain referred to Criminal Court
Austria plans social media ban for children under 14
Trump says Iran's 'present' to US was allowing 10 oil tankers through Hormuz
