The lifeless bodies of a young couple have been found floating in the swimming pool of a luxury hotel in Hertfordshire.
Police were called to Down Hall Country House Hotel in Hatfield Heath at about 7.35pm on Saturday.
Hotel staff and ambulance crews tried to revive the couple but both were pronounced dead at the scene.
Investigating officers from the Kent and Essex Serious Crime Directorate are treating the deaths as unexplained at this stage.
The man, who was in his 30s and the woman, who was in her 20s are both believed to be from the London area.
The couple had been staying together at the hotel, which was hosting two wedding parties this weekend.
Guest Louise Saunders told the BBC an ambulance and two paramedic cars arrived at the hotel as she was leaving to go for dinner.
She said about three hours later police were "everywhere" and were taking down the names and numbers of guests.
The windows of the building housing the swimming pool had been blacked out with plastic sheets, she added.
A police spokesman said that post-mortem examinations will be carried out on Monday.
The 110-acre hotel, which dates back to 1322, is described as "one of England's most established country house hotels" on its website and regularly hosts weddings, christenings and other large functions.
Down Hall Country House Hotel was the venue for the wedding of the late Jade Goody to Jack Tweed in 2009. It regularly hosts murder mystery weekends.