Gas smell reported by hundreds in Treforest and Pontypridd
Hundreds of people have reported a smell of gas across of wide area of south Wales.
It seems to be located in Pontypridd and Treforest, Rhondda Cynon Taff, but Wales and West Utilities received more than 700 calls from north Cardiff to Merthyr Tydfil.
South Wales fire service said checks at Treforest and Troedyrhiw industrial estates had not revealed anything.
Wales and West Utilities said the smell was not from a leak in its network.
One woman tweeted she had been evacuated while at work.
Julie Jones said: "Evacuated from our building [for] an hour due to a strong smell of gas in Nantgarw. All across the area from what I've heard? Anyone else?"
Richie Jones, Wales and West Utilities gas emergency service manager for south Wales, said: "Our engineers are visiting affected areas, but there are no readings of gas in the air and this smell has not been caused by a leak from our gas network.
"However, if anyone smells gas, thinks they have a gas leak or suspects carbon monoxide poisoning, they should call us on 0800 111 999.
"Trained colleagues will take their call, give them advice, and our engineers will be there to help, day or night."