According to local authorities, an 11- and 13-year-old British sibling drowned on a beach on Spain's east coast.
The two children and their father were pulled out of the water at Llarga Beach in Salou on Tuesday night by the Emergency Service.
“It is sad that despite the best efforts of the rescuers, the boys and girls are still unable to be saved,” said local police force chief José Luis Gargallo.
He added that his father survived “even though he swallowed a lot of water and was in a state of exhaustion.”
Officials earlier reported that the children who died were all boys, not boys and a girl.
“The sea is rough and people sometimes underestimate its strength, especially in this area, which is usually very calm,” Mr. Galgaro said.
“There is no danger 90% of the time that beach is considered an ideal place to swim. [Tuesday] It's different – not only on that beach, but on the entire coast. ”
The lifeguard on the beach has ended, and the emergency call is around 21:00 for the drowning child.
Mr Gagaro said the child and father came from a family of five, and the mother and other children returned to the nearby hotel.
He added that authorities will “review everything” and take steps to prevent any similar future events.
Local authorities in Salou said in a speech by the BBC that the tragedy on Tuesday night made them deeply saddened.
A minute of silence was held outside Saru Town Hall before noon Wednesday.
Police earlier said the ocean was rough and there were yellow flags on the beach all day – meaning swimming, but caution was recommended – local media reported.
Seven medical departments were dispatched to the scene, and police and fire departments also attended the meeting.
Authorities also sent a team of psychologists to support the family.
A 54-year-old German man also drowned Tuesday at the Cap de Sant Pere de Cambrils, not far from the coast of Llarga Beach.
Officials added that the death toll on Catalonian beaches has brought the death toll at 16 since the summer began on June 15th – 5 more than last year's same period.
A spokesman for the British Foreign Office said: “We are supporting families of two British children who died in Spain and contacted local authorities.”
Civil Protection Forces urged “the importance of taking extreme precautions in beaches, swimming pools and inland waters this summer”.
According to the city of Saru, about 1.3 million British tourists visit the town each year.
This is after many other British deaths in Spain this summer.
Earlier this month, two British men, aged 19 and 26, were killed in a separate incident at a hotel and music venue in Ibiza.