Lothian and Borders Police are appealing for witnesses after two caravans were set alight in East Lothian.
The incident happened around 1am Thursday at the Aberlady Caravan Site.
Two separate units were found alight and Lothian and Borders Fire and Rescue Service attended to tackle the blaze.
Both caravans were completely destroyed as a result of the fires, while several others in the surrounding area sustained minor flame damage.
Detectives are treating this incident as suspicious and would urge anyone who can assist with their enquiries to come forward.
A police spokesman said:
Fortunately neither of the caravans were occupied at the time or this could have been a far more serious incident.
Nevertheless, these fires resulted in several thousand pounds worth of damage and we are carrying out local enquiries to identify those responsible.
Anyone who was in or around the caravan site in the early hours of yesterday morning and remembers seeing anything suspicious is asked to contact police immediately.
If you have any information, please contact Lothian and Borders Police using the following contact details: