A woman has been arrested on suspicion of gross negligence manslaughter after a deadly paddleboarding incident on the River Cleddau in Haverfordwest, Wales.
Police said the woman was from South Wales and had been subsequently released under investigation.
They said a fourth person had died after the incident. Andrea Powell, 41, had been admitted to hospital.
Morgan Rogers, 24; Nicola Wheatley, 40; and Paul O'Dwyer, 42, died earlier in the day.
A further five people were pulled out of the river by emergency services but were not injured.
The group were from the South Wales Paddle Boarders and Salty Dog Co, an organisation in Port Talbot, and had been on a weekend trip exploring the river.
One of those on the trip, Vickie Mckinven, said O'Dwyer, a former soldier, died trying to rescue two fellow paddleboarders who got into difficulty.
Hundreds of people gathered in Port Talbot on Saturday morning in memory of O'Dwyer.
During the event, members of the Aberavon surf club, many of them close friends of O'Dwyer, took to the water despite the choppy sea.

Lee West, a business partner of O'Dwyer, paid tribute to his late friend, who was a former director of COPR Bar in Swansea and the founder of veterans' charity Sa1ute.
"He was great fun. He'd be like your corny uncle in the corner with his corny jokes," he told Wales Online.
"He was just a genuine lovely, lovely man."
Relatives of Rogers, a deputy store manager, called her "a beautiful, kind and loving soul".
Wheatley, a specialist in poisons information at the National Poisons Information Service, was described by her family as "loving mother, daughter, daughter-in-law and wife".
Sole survivors
- Cecelia Crocker was on board Northwest Airlines Flight 255 in 1987 when it crashed in Detroit, killing 154 people, including her parents and brother. The plane had hit a light pole on take off
- George Lamson Jr, from Minnesota, was on a Galaxy Airlines flight that crashed in Reno in 1985, killing 68 people. His entire seat was launched out of the plane
- Bahia Bakari, then 12, survived when a Yemenia Airways flight crashed near the Comoros in 2009, killing 152. She was found clinging to wreckage after floating in the ocean for 13 hours.
- Jim Polehinke was the co-pilot and sole survivor of a 2006 Comair flight that crashed in Lexington, Kentucky, killing 49.
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