Did you hear the eerie wail of Syngenta's siren today?
The Huddersfield firm tested its public warning system this morning, designed to alert residents in Deighton and Dalton in emergencies.
Syngenta has tested its sirens every year since 1985, and introduced a new, louder three siren system last year.
Today Kirklees Environmental Health officers monitored the siren testing at the request of the pesticide manufacturer.
Syngenta ran a five minute cycle, with a five minute break before another 30 second test.
It ran two further one-minute cycles of before completing the test at around 11am.
Kirklees Council tweeted a warning to make sure people didn't think the zombies were coming.
It tweeted: "Hearing strange noises in Huddersfield? It’s siren testing at Syngenta (not an ill wind or the zombie apocalypse)."
Some people confused the siren with their hoover.
Atiyah Yaqoob tweeted: "I thought it was just me who heard an air raid siren, convincing myself it was just a vacuum cleaner, obviously not."
A user called Insomniac had clearly missed the warnings - he tweeted: "What's with the WWII sounding alarm in Huddersfield??? Are we being invaded?? Should I be afraid?"
People on Twitter have reported being able to hear the siren loud and clear in Quarmby, Lowerhouses and at at the University of Huddersfield campus.
Examiner Facebook fans said they heard the siren in Almondbury, Newsome, Crosland Moor, Golcar, Marsh and Heckmondwike.
Last year's test sparked a flurry of social media complaints, with claims it could be heard as far away as Meltham and requests for the chemical plant to 'pack it in' - but residents seemed to be more prepared for today's soundcheck.
Some had their own ideas as to what the strange noise was, too!
On Facebook, Steve Hutton said: "Thought it was the wife trying to sing."
Ryan Zack Price said: "Sounded like dogs howling."
Want to know what the sirens sound like? Click below to watch our video.
And our canine friends were certainly perturbed by the sirens in Lowerhouses, as this video tweeted to us by Tim Hoggarth proves:
For more information about Syngenta and what to do in a real emergency, click here.
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