Police remain in Sheffield street amid cyanide poisoning fears
Police officers, firefighters and paramedics arrived at Lupton Road Lowedges, shortly after 8.20am and sealed off part of the street.
The cordon is now centred around a house where an occupant is reported to have ingested cyanide.
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Hide AdResidents claim the occupant was taken to the Northern General Hospital.
South Yorkshire Fire and Rescue said two appliances - from Lowedges and Rotherham - were sent to the scene at 8.20am but no other details have yet been released.
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Hide AdA fire service incident commander is at the scene overseeing developments.
A spokeswoman said the operation is being led by South Yorkshire Police.
One resident said specialist 'chemical teams' are at the scene.
Another said: "It looks like a war zone."