There's something fishy going on in Teesside.
Shoppers have been cutting trips short.
And pets are being blamed for producing a noxious odour.
Twitter users have been sharing their experiences about the fishy smell that's hit the area.
It has been reported in areas including Linthorpe, Acklam, Thornaby, Billingham, Ingleby Barwick, Yarm and Middlesbrough town centre. The emergency services and Public Health England are unaware of any incidents that may have caused the smell.