A fire near Brentwood, that destroyed 12 lorries and caused £1 million worth of damage, is being treated as arson.
Eight fire crews, and more than 30 firefighters, were called to a container company on Codham Hall Lane in Great Warley just after 12.30am on Sunday, May 19.
Essex Police say separate fires were started in the cabs of all 12 lorries.
The site, which is close to Junction 29 of the M25, is on a former construction site which was used during the widening of the motorway.
Investigating officer Pc Richard Dines said: "The transport yard is close to the A127 and the M25 and we would like to hear from anyone driving past who might have seen any suspicious activity in the area.
"We believe that whoever started these fires might have broken into each lorry to start a fire in the cab which means they could have been in the yard for some time before 12.30am.
"We also want to hear from anyone who might have any information about any events leading to the arson attack."
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