A grandfather was attacked by youths with CS spray in an attempted robbery at his home in Southampton.
The man and his wife, in their 60s, challenged four youths who had entered the house in Outer Circle on Sunday and demanded money.
He refused to give the youths any money and they drove off in a dark car.
Two grandchildren were also in the house. The man was treated by paramedics but nobody else was hurt.
The family was left very upset and shaken by what happened, police said.
Part of Outer Circle was sealed off for more than four hours while a forensic examination was carried out.
Police said the incident appeared to be and isolated case but have appealed for anyone who knows anything about it or the suspects to contact police.