Burning bottles on Trowbridge building site 'probably old military flares'
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The fire service said it was unsure exactly what chemicals were involved
Builders working near a school dug up a number of glass bottles containing "wartime incendiary devices".
A bomb squad was called to Wingfield Road, Trowbridge, after the bottles - thought to contain "old military flares" - were unearthed.
People living near the building site - opposite an entrance to John of Gaunt School - have been told to leave their homes or stay indoors.
The fire service said it was unsure exactly what chemicals were involved.
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"We're dealing with an unknown hazard and have called the military who have more experience", a spokesman said.
The Army team is expected to detonate the devices before 20:30 GMT.
Dorset and Wiltshire Fire and Rescue said a large amount of smoke would be generated and people living in the immediate area should keep their windows and doors shut.