Prince Philip, husband of the U.K.’s head of state Queen Elizabeth II, has been admitted to hospital, royal sources said on Wednesday.
The Duke of Edinburgh was hospitalized as a “precautionary measure” Buckingham Palace said.
The Queen is currently attending the state opening of parliament, setting out the government’s policy agenda for the next four years.
It is thought Prince Philip, 96, is receiving treatment for an infection arising from a pre-existing condition.
In May it was announced he would end all public engagements as of autumn this year.
Prince Philip was admitted to hospital three times in nine months between December 2011 and August 2012 and spent 11 days in hospital care because of a bladder infection in 2015.
The Queen and the Duke are to celebrate their 70th wedding anniversary on Nov. 20 this year.