New York siblings confirmed dead in Brussels attacks: Brother and sister who were on the phone to family when blasts occurred are identified as victims

Dutch siblings who were living in New York have been confirmed among the dead in the Brussels terror attacks.  

The family of Sascha and Alexander Pinczowski have learned that the two were killed in the Tuesday bombing at Brussels Airport.

The siblings were on the phone to their mother in Holland when the first explosions were heard and the line went dead.

Earlier Friday, U.S. officials said that two Americans had been confirmed dead, but did not reveal their identities. An official told ABC News that the victims were the spouses of U.S. personnel.

Among the other Americans that remain missing after the attacks are married couple Justin and Stephanie Shults from Kentucky, who were working as accountants in Belgium.

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Alexander (left) and Sascha Pinczowski (right) have been confirmed dead in the Brussels Airport attack

The Dutch siblings were living in New York and were catching a flight back to the U.S. on Tuesday when the first explosions happened  

Alexander Pinczwoski (left) was engaged to Cameron Cain (right), the daughter of the former U.S. Ambassador to Denmark James Cain

James Cain, the former U.S. Ambassador to Denmark whose daughter Cameron was engaged to Alexander Pinczowski, released a statement on behalf of the family on Friday. 

'We received confirmation this morning from Belgian Authorities and the Dutch Embassy of the positive identification of the remains of Alexander and Sascha. 

'We are grateful to have closure on this tragic situation, and are thankful for the thoughts and prayers from all. The family is in the process of making arrangements,' the statement read. 

Cain, who now lives in Raleigh, Virginia, remembered Alexander as a 'brilliant young man' who was clever and 'intimidatingly smart'.

ISIS has claimed responsibility for the blasts at Brussels Airport and a metro station, which have killed 34 in total and injured more than 270 people. 

Alexander Pinczowski was living in New York with his girlfriend, and his sister Sascha was splitting her time between America and Europe after graduating from Marymount Manhattan College with a degree in business last May. 

She reportedly had plans to settle permanently in Manhattan at the time of her death.  

According to her Facebook page, Sascha was originally from the seaside town of  Vouliagmeni in Greece.

Their father lives in the Netherlands and traveled to Brussels to aid in the search when his children were first reported missing. 

In the wake of their deaths, tributes to the Pinczowski siblings have been flooding social media sites. 

Arielle Parker, who works at a New York law firm and attended high school with Sascha in Germany, told Daily Mail Online that she was 'a bright light and a joy of a person'. 

'She was always herself and lived life to the fullest. We lost a beautiful person inside and out,' Parker said.  

The brother and sister were on the phone to their mother in Holland when the first explosions were heard and the line went dead. Above, the aftermath of the bombing at the Brussels Airport

Later, another attack happened in the Maelbeek Metro station in central Brussels, near the European Union headquarters 

While the total death count remains unconfirmed, many are still recorded as missing, and up to a dozen Americans are said to be injured, according to U.S officials.

Among the missing are Stephanie and Justin Shults from Lexington Kentucky, who are currently living in Brussels and working as accountants.

The couple had just dropped Stephanie's mother Carolyn Moore at the airport when the first blasts went off. 

While Moore survived the attack and has been in contact with family back home, her daughter and son-in-law have not been seen or heard from since and their phones keep going to voicemail. 

At least two Americans remain missing. Stephanie and Justin Shults (pictured) had just dropped Mrs Shults' mother off at the airport when the first attack happened and they haven't been seen since

Location: The attacks at the city's airport and a metro station near the EU headquarters killed 34 people

Secretary of State John Kerry is in Brussels on Friday to meet with the Belgian Prime Minister Charles Michel.

'The United States is praying and grieving with you for the loved ones of those cruelly taken from us, including Americans, and for the many who were injured in these despicable attacks,' Kerry said.

He also renewed vows to continue the fight against ISIS, which has claimed responsibility for the attack.

'We - all of us representing countless nationalities - have a message for those who inspired or carried out the attacks here or in Paris, or Ankara, or Tunis, or San Bernardino, or elsewhere: We will not be intimidated. We will not be deterred.

'We will come back with greater resolve - with greater strength - and we will not rest until we have eliminated your nihilistic beliefs and cowardice from the face of the Earth,' Kerry said.