A house in North Lanarkshire was set on fire while a family, including a young child, was still inside.
The incident happened in Main Street, Caldercruix, at around 11.30pm on Monday.
Police said no one was injured, but the family has been left “extremely distressed”.
Detective sergeant Gary Smillie said: “There were people in the house at the time, including a young child. Fortunately no one was injured.
“This was an extremely reckless act and has left the occupants extremely distressed as well as causing damage to the property.
“We are eager to speak to anyone who may have seen anything suspicious before and after the incident.
“No matter how small, please get in touch as it could help with our investigation.
“In particular we would like people to check any private CCTV they might have or dashcam footage that may provide details that could help.”
If you have any information, call 101 or Crimestoppers anonymously on 0800 555 111.