Superintendent Richard Moore of Birmingham Central Police said the fatal stabbing of two men in Birmingham city centre was a "dreadful" and "exceptionally rare" incident.
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Finnish media say several people have been wounded in a stabbing in the city of Turku in western Finland.
Longer spells of rain across eastern Scotland with a weather warning in place until 6pm.
Julian Cadman, who is thought to have dual British-Australian nationality, became separated from his mother who was injured in the attack.