Three people were killed and at least two others seriously injured when a man went on a stabbing rampage at his apartment building, Spanish officials said today.

An Interior Ministry official said the suspect left his upper floor apartment in the eastern city of Valencia late yesterday and went downstairs knocking on doors at random as he descended.

The occupants of one apartment opened the door and the suspect knifed and killed a 50-year-old man and his 13-year-old son. He also seriously injured the man's 48-year-old wife.

The official said that elsewhere in the building a 77-year-old woman was stabbed to death and a 44-year-old man was seriously injured.

The man has been arrested, but a motive for the attack has not been given.

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