Fat found on beaches between Gower and Vale of Glamorgan
Lumps of "rancid" fat have washed up on several more beaches along the south Wales coast, say environmental experts.
Natural Resources Wales (NRW) issued a warning on Friday after deposits were spotted at Ogmore, Vale of Glamorgan.
Officials now say more samples have been reported at neighbouring Southerndown as well as Newton near Porthcawl, and Oxwich and Llangennith on the Gower.
Dog owners are advised to keep pets away as it could pose a risk.
NRW said several animals had fallen ill after eating the fat, believed to be rancid, degraded vegetable oil.Inspect and clear
Samples have been taken away for analysis but experts say the fat is likely to be related to several incidents along the south west coast of England over the last month.
"Dog owners are advised to be extra vigilant as their pets are particularly attracted to this type of waste," said an NRW spokesperson.
The fat is not thought to be harmful to children unless eaten.
Vale of Glamorgan council said on Friday that environmental health officers were investigating the first incident at Ogmore.
The council's waste management team will inspect and clear the coastline in Ogmore daily until the white substance stops appearing.