Emergency services responded to an incident in Highfields, Saffron Walden (Image: NPTV)
A potential chemical threat closed a Saffron Walden road last night (Tuesday).
Emergency services including a HAZMAT unit, police, fire and ambulance staff were in attendance shortly after 7pm.
A resident in Highfields, Saffron Walden, had received a letter containing an unknown substance.
The road was closed as a precaution.
Essex Police said they did not find any hazardous substances.
Enquiries into the source of the letter are ongoing.
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