Detectives are appealing for information after a fire was deliberately set at a waste and recycling plant.
Police were called to the scene at Greendykes Industrial Estate, Broxburn on Thursday at around 6.10pm following reports of a fire.
The blaze caused substantial damage to machinery and following enquiries, is being treated as deliberate.
Police are also investigating whether the fire is linked to two others at Albyn Industrial Estate in Broxburn in the past week.
Detective Constable Adam Gow from Livingston Police Station said: “Luckily no one was injured as a result of this crime.
“Our investigation is ongoing and we have been carrying out enquiries in the industrial estate and gathering CCTV footage from in and around the area to gain further information on those responsible for starting this fire.
“Two young men wearing dark-coloured clothing were seen near the premises around the time the fire was set and we are working to track these suspects down.
“I would appeal to anyone who was in the area between 6.30pm and 7.30pm on Thursday afternoon, who may have seen these men acting suspiciously, or who has any information on their identity to contact us as soon as possible.
“I would also be keen to speak to anyone who was driving in the area of Greendykes industrial estate with dash-cam footage, as it may have captured detail that will help our ongoing inquiry.
“We are also working to establish if this fire is linked to two other fires at Albyn industrial estate in Broxburn that took place at 7pm on Wednesday June 9 and 7am on Friday, June 11.
Anyone with information should contact officers through 101 quoting reference 3100 of June 10. Alternatively Crimestoppers can be contacted on 0800 555 111, where anonymity can be maintained.