The mother of the young social worker allegedly stabbed to death by a 15-year-old asylum seeker at a shelter for refugee children today spoke of her anguish as the family blamed Sweden's immigration crisis for her death.

Chimene Mezher, 42, today told how she had lost her "angel", as a close cousin said: "It is the Swedish politicians' fault that she is dead."

The family is blaming record immigration to Sweden for her death.

Alexandra Mezher, 22, was working alone with 10 youths aged between 14 and 17 when she was attacked at the home for unaccompanied young refugees in Molndal, near Gothenburg. She died of her injuries in hospital.

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The mother described her "fair" daughter, adding: "She was my air, she was my everything, why her?

"She was not just my daughter, she was my angel. She was a just and fair human being. There were so many who loved her. She was my daughter, my friend, my mate," Mrs Mezher told GoteborgsPosten.

Alexandra was the daughter of a Lebanese immigrant who came to Sweden in 1989 from Beirut.

Police spokesman Christer Fuxborg said two people were holding down the male suspect when police arrived on the scene. He said a 22-year-old woman later died of her wounds. Police arrested a suspect.

Fuxborg said there were signs of a violent fight at the home, which houses about a dozen 16- to 18-year-old migrants and other youths. He couldn't give further details pending a police investigation.

Police union director Lena Nitz told Swedish press "It is obvious that the migrant situation is a great strain. The situation is completely unsustainable."

- Telegraph, DailyMail, AP, nzherald.co.nz