Police forensic officers are at The Brittox in Devizes investigating an incident which is believed to have taken place outside the entrance to Boots late on Friday night or early on Saturday morning.
Officers at the scene would not comment but swabs were taken from an area of pavement for analysis.
One entrance to Boots remained taped off but the store was open as usual.
It is expected that CCTV footage from the area will be scrutinised.
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