A brother and sister drowned after being swept out to sea on a "dangerous" beach with their family.
Dad Jeremy Stiles, 47, from Portland, Oregon, US, was also washed away with his children on Saturday.
However, Mr Stiles survived and is now recovering from hypothermia in hospital.
His son William, four, and daughter Lola, seven, died in the tragedy.
According to Yahoo News , resident Joanne Cornelius said: "It’s a dangerous beach. It’s a thing that people have to be aware of in winter at the beach at the Oregon coast.
"There’s dangerous waves, and when the signs are up, people have a tendency to walk right by.
"It was tragic, just absolutely tragic."
A GoFundMe page set up to help the family financially has already raised more than £42,000, despite being started less than a day ago.
A statement on the page said: "Over the weekend - members of our family - Jeremy Stiles (47), Lola Stiles (7) and William Stiles (4) - were involved in a tragic accident at Cannon Beach when a sneaker wave creeped up onto the beach trail they were walking on and pulled them out to sea.
"Lola was pronounced dead at the hospital, William’s body has not yet been recovered and Jeremy is recovering from hypothermia at Seaside Hospital.
"The Stiles/Romaine families want to thank everyone for their thoughts and prayers and especially the support of the first responders and Coast Guard during this horrific tragedy for our family.
"First responders have reported that they were on an off beach trail and when the waves came up and pulled them in.
"Our hearts as you can imagine could not be more broken as both children were loved beyond measure by our entire family and so many others.
"We are requesting support to help the Stiles family with funeral expenses as well as the grief and trauma supports for the parents and extended family to recover from such a tragic loss."
A police officer managed to pull Mr Stiles's daughter from the water, however she later died in hospital.
