Police say there is "no suggestion" of people jumping from Bournemouth pier or of jet skis being involved in the deaths of two children.
Dorset Police said they received a report from paramedics at around 4.30pm on Wednesday afternoon of people requiring assistance on the beach off the city's pier.
Emergency services attended the scene and 10 people were recovered from the water, with two people - a 17-year-old boy and 12-year-old girl - later dying in hospital.
A statement from police today said: "It is clear that yesterday, a number of people already in the water got into difficulty and we are investigating the circumstances or event that caused that to happen.
"Early investigation indicates that there was no physical contact between a vessel and any other swimmers at the time of the incident.
"I can also confirm there is no suggestion of people jumping from the pier or jet skis being involved."
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Bournemouth beach tragedy must have been 'terrifying' experience
Councillor Vikki Slade, leader of Bournemouth, Christchurch and Poole Council, said the incident in the sea that left two teenagers dead on Wednesday must have been a "terrifying" experience.
She said: "Again I want to add our sincere condolences to the families of the children who lost their lives, and our thoughts are with the families of the young people that were in the water.
"It must have been a really terrifying experience for everybody.
"The services worked incredibly well together. Our staff on the beach all rallied round to support the emergency services."
She said there are additional staff available for the public on the beach on Thursday and over the weekend, adding that the council wanted to make sure the RNLI are "very visible" and that teams are available there to support people.
Two children dead after 'major incident' at Bournemouth beach as man arrested
A man has been arrested for manslaughter after two children died following an incident at a Bournemouth beach.
A 17-year-old boy, from Southampton, and a girl, 12, from Buckinghamshire, were pulled from the water before being rushed to hospital where they were pronounced dead.
The circumstances remain unclear, however police have confirmed a man in his 40s was detained amid the the horror on North Beach yesterday.
During a lunchtime press briefing today, assistant chief constable Rachel Farrell also confirmed the victims were not related and not known to each other.
Read more here.
Teenager desperately tried to save girl, 12, after finding her in sea
A teenager was the first person to find a 12-year-old girl floating dead in the water at Bournemouth beach yesterday, his father revealed.
The child and an older boy, aged 17, both died during the tragedy which has since seen a man in his 40s arrested on suspicion of manslaughter.
Dorset Police have confirmed a vessel does not appear to have struck the pair - though there is some speculation they drowned after being caught up in the wash of a jet ski.
The beach was packed with families during the half-term heatwave, but the incident saw everyone evacuated as air ambulances landed on the sand.
Read more here.
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Max Willcock/BNPS)Bournemouth beach cops say nobody jumped from pier as mystery deepens over kids' deaths
Police say there is "no suggestion" anybody jumped off the pier prior to the tragic deaths of two children in the sea off Bournemouth beach yesterday.
A man in his 40s who was 'on the water' at the time has been arrested for the manslaughter of the 12-year-old girl, from Buckinghamshire, and 17-year-old boy, from Southampton.
The two victims suffered 'critical' injuries in the incident that happened next to Bournemouth Pier on one of the hottest days of the year.
During a lunchtime press briefing today, assistant chief constable Rachel Farrell also confirmed the victims were not related and not known to each other.
Read more here.