Warehouse fires especially in Jurong were a regular event in the past. Many of them were due to arson, the result of business owners getting rid of old stock or large stock that does not meet specs in the contract. Even popular among textile stores in old Boon Lay where shop fires were an occasional event when textiles designs and colours got out of fashion within 2 to 3 years. The favourite method is the joss stick and mercury which makes detection difficult. The most famous arson case involved a warehouse in the West Coast where chassis manufactured for Apple Monitors were torched when the colour spec was not the right pantone code. Massive fire, nothing to work with. One interesting common clue is the owner's alibi where he attends a big dinner in the presence of his family in a well known restaurant at the time of fire. Another well known case that went horribly wrong is Paris Silk Store where the brothers hired 2 NS man from Nee Soon Camp to set the store on fire but both died in the fire.
The worst case is a commercial office cum workshop in Bukit Merah Central. The owner unrolled toilet rolls all around soaked in petrol. Too much evidence as the fire did minimal damage.
The above courtesy of a Insurance chap during a the Tarik session. Quite interesting and seldom in the news.