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There are fears dangerous poison could get into the wrong hands after it was stolen in a burglary at an industrial estate.
Items worth more than £25,000 were taken from the Riverside Industrial Estate in West Hythe Road, including potentially hazardous pest control chemicals.
Raiders also took an industrial woodchipper valued at £25,000, a quad bike and trailer worth £2,500, a petrol-driven saw cutter worth £300 and three electric drills.
Four small flasks of Phostoxin were also taken, which is an industrial chemical used for pest control.
Officers have warned people that the Phostoxin is potentially hazardous in the wrong hands.
Detective Sergeant David Gilbert said: "Phostoxin is a highly toxic substance that is strictly controlled and should only be used by professional, trained operators. We are concerned that it could prove dangerous if incorrectly handled."
The flasks, which stand about 10cm high and have a red cap, are labelled Phostoxin and carry hazardous warning signs.
They each contain 33g tablets of the chemical.
Officers have asked the public to call immediately if they come across the flasks or are offered them for sale.
The site was targeted between 6pm on Thursday, October 13 and 6.30am on Friday, October 14.
Anyone with information is asked to phone police on 01843 222289 or Crimestoppers anonymously on 0800 555111 quoting reference ZY/36972/16.