Three people were killed and six were in intensive care after dry ice thrown in a swimming pool caused acute poisoning at a popular Russian blogger's birthday party.

The victims suffered from carbon dioxide poisoning after the dry ice was mixed with pool water.

Some guests were reported to have suffered from chemical burns.

They are the blogger's husband Valentin (Valya) Didenko, 32, plus party-goers Natalia Monakova and Yuri Alferov, both 25, were confirmed dead at the scene.

The distraught Russian blogger who lost her husband and two friends in the horrific incident today posted a video announcing their deaths.

The three died from carbon monoxide poisoning at Ekaterina Didenko's 29th birthday party last night.

In a painful video, the popular blogger - a mother-of-two who has one million followers - was in tears as she told her daughter was asking her 'Where is Daddy?'

The party was for blogger Ekaterina Didenko, pictured last night (right) and this morning (left), who was celebrating her 29th birthday in Moscow

Natalia Monakova, one of the deceased, is pictured in an Instagram post before the tragedy

But she didn't know what to reply.

'Valya is not with us any more,' said the weeping social media icon after being released from hospital.

'Or Natasha (Natalia). Or Yura (Yuri).

'I can't tell you anything else.

'I have signed a ban to disclose any information.

'I can't say anything.

'I did not cry yesterday…today I just exploded.

'I thought it was not true, it was a nightmare.

Yuri Alferov (pictured), 25, died last night after Valentin Didenko (not pictured), 32, poured 55lb of dry ice into a swimming pool in Moscow

'Nastya (daughter) woke up today - 'Where is daddy?'

'I do not know what to say to her…

'She is asking me: 'Why are you crying?'

Earlier Ekaterina had posted from hospital to say her husband was, like her, in intensive but she did not know at this point that he had died.

Dead bodies are pictured being removed from the sauna in Moscow where the birthday party took place

She was among those in intensive care after her husband Valentin Didenko, 32, unloaded 55lb of dry ice to create a dramatic 'visual effect' intended to impress guests at a Moscow pool and sauna complex.

He too was in intensive care after emergency services were called to the party.

Ekaterina - who was initially wrongly reported to have been killed - posted: 'I am alive, I am behind the doors of an intensive care ward.

An image shows guests around the table at Didenko's party in Moscow before the tragedy

A picture shows one of the guests at Didenko's party in Moscow before the tragedy

Police are pictured arriving at the scene in Moscow after the tragedy

'I don't know who died…

'Valya (husband Valentin) is in the intensive care, I don't know what state he is in.'

Dry ice is frozen carbon dioxide and produces heavy vapour when put into water.

The vapour can cause high levels of carbon dioxide in blood when released in a poorly ventilated space.

Valentin wanted the dry ice 'to create an impressive steam show' as party guests jumped into the pool.

But as soon as the ice was poured, people started fainting.

Moments earlier guests had been laughing and clinking glasses.

Reports said Natalia Monakova and Yuri Alferov died from pulmonary edemas after breathing excessive carbon monoxide.

Monakova is pictured in an image from social media before the Moscow tragedy

A female guest is pictured walking towards the pool before the tragedy at Didenko's party in Moscow

Natalia Monakova, one of the deceased, is pictured in an Instagram post before the tragedy

Mother-of-two Ekaterina is a popular Instagram blogger with one million people following her account which gives advice on medicines for home use.

A highly qualified pharmacist, she gives advice on keeping home medicine cupboards leaner and more effective while also sharing intimate moments of her own life.

In some videos she is seen filming chemical experiments with her young daughter.

Didenko is pictured holding balloons for her 29th birthday moments before the tragedy in Moscow

A big crowd of the couple's friends were seen clinking glasses moments before the tragedy in the south of Moscow.

Ekaterina's husband Valentin bought dry ice 'to create an impressive steam show' as the party guests jumped into a pool.

But as soon as the ice was poured in people started fainting. Paramedics failed to rescue two of the guest who were pronounced dead at the site.

The Russian Investigative Committee confirmed a criminal case was opened into causing death by negligence.

The 'preliminary reason for the death of three (partygoers) was mechanical asphyxia because their airways were blocked', reported crime channel 112.

The three were in the pool when the dry ice was released and could not breathe.

Five people remained in hospital this morning.