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29 October 2012, 10:54 | Updated: 29 October 2012, 10:59
Police now think TWO fires were started at a disused factory in Kettering
The blaze happened on Friday night between 10pm and 11pm on Field and Dryden Streets.
The Fire Service say extensive damage was caused to the property which could have caused damage to residential properties nearby.
Police are asking any witnesses to contact them.