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Police in Austria say a 23-year-old man has admitted carrying out knife attacks in Vienna which left four people seriously injured on Wednesday evening.

The man, an Afghan national, has denied a political motive for the attacks.

Three members of the same family were hurt in the first attack at Nestroyplatz at 19:45 (18:45 GMT) and an unrelated man, 20, was stabbed nearby around half an hour later.

The suspect reportedly told police he had been in a "bad, aggressive mood".

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He said he had attacked the 20-year-old man, an acquaintance, because he held him responsible for his past drug addiction, the police added.

The fourth victim is a fellow Afghan national, local media report. Earlier reports had said he was from Chechnya.

The father of the family, who is 67, remains in a critical condition in hospital.

The lives of the mother, 56, and 17-year-old daughter, as well as the 20-year-old unrelated victim, are now out of danger.

The suspect categorically denied a political motivation when questioned, police said.