The boy’s 16-year-old sister has already died and his mother is in a serious condition following the incident at the family’s summer cottage outside Karlskoga .
“This is a tragic accident,” said Marianne Alexandersson, investigator at Karlstad police, to newspaper Nya Wermlands-Tidningen.
The boy passed away on Monday evening.
The accident happened when gas leaked out of a pipe to a refrigerator in the cottage. The leak was discovered by a neighbour who was called by the father of the family when he was unable to get in touch with any of the other family members.