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Police on Spain’s Costa Blanca have arrested a British man
The 70-year-old was held in the holiday resort of Denia after the 20-year-old victim was hit repeatedly over the head with a hammer while he slept.
His wife – the young man's mother – was also taken to hospital after being injured as she tried to prevent the attack.
Police say neighbours averted a tragedy after seeing the detainee struggling with his partner at the entrance to their home and calling 999.
Officers seized the hammer from the OAP after rushing to the detached property and finding him covered in blood with the weapon still in his hand.
The victim was rushed to hospital after detectives followed a trail of blood leading to the spot where the attack took place and discovered him lying semi-conscious in bed.
His injuries, like those of his mother, are not said to be life-threatening.
The incident took place around 10am on Sunday.
It is thought investigators are probing the possibility the Brit OAP, who has not been named, suffered a psychotic episode.
The suspect is being probed on suspicion of attempted homicide
A spokesman for Spain's National Police confirmed: "We have arrested a British man aged 70 who smashed his 20-year-old son in the head with a hammer while he slept.
"His partner, the mother of the young man, was also injured whilst trying to prevent her husband from assaulting his victim.
"Neighbours spotted the detainee shaking his wife at the door to their home and called the emergency services.
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"When police arrived they found the attacker covered in blood with the hammer still in his hand.
"They acted quickly and decisively, managing to seize the weapon and arrest him.
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Police say neighbours averted a tragedy after seeing the detainee struggling with his partner
"There was a trail of blood which led inside the property, where officers found the young man aged 20 with a serious head injury."
The spokesman added: "The suspect is being probed on suspicion of attempted homicide."
None of the Brit trio have been named.
It was not clear today whether the detainee was being held in prison or in hospital.
A source was unable to say whether the family lived permanently in the area or were at a holiday home, although he said the Brit pensioner spoke no Spanish.