Police said a 66-year-old woman was one of two people stabbed today at a Cardiff cemetery in an apparently unprovoked attack.
South Wales Police have arrested a 25-year-old man in connection with the incident, which left the woman in hospital undergoing surgery. Her injuries are not thought to be life-threatening.
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It comes after security was stepped up around the country following the Manchester Arena attack which killed 22 people.
A murderer nicknamed 'Houdini' after escaping the death penalty seven times has been given the lethal injection.
The distress signal sparked a police hunt in the area to find the person or group who made it.