Police say several dogs have died after coming into contact with algae at a nature reserve near Castleford.
West Yorkshire Police say its officers on patrol at St Aiden’s Nature Reserve between Leeds and Castleford at Methley spotted a blue/black algae.
From speaking to RSPB staff, officers say several dogs have died after entering the lakes in the last week.
A West Yorkshire Police spokesman said: “This particular algae is extremely dangerous to dogs and can cause death in a short space of time.
“Please do not let your dogs enter or drink the water.
“It can also be harmful to humans.”
St Aidan’s is a 400-hectare country park on a former opencast mine which closed in 2002.