A dog attack that left a female swan with three cygnets dead has sparked outrage.
Police are still searching for owner of the dog, which was not on a lead, following the incident at Chorley Council-run Yarrow Valley Country Park.
The attack was witnessed by a woman who saw the dog run down the hill to the sandy bank of the big lodge.
Afterwards, the owner shouted to the dog and walked off. The incident was reported to the rangers by the witness.
The swan is thought to have been out of the water, protecting her young.
Police are investigating.
We know there has been chat on social media about whether dogs should be on leads at all times in the park.Coun Bev Murray
The RSPCA has been contacted and the cygnets will be monitored to check if they are being looked after by the male swan. If possible they will remain on the lodge, otherwise they will be re-homed.
Coun Bev Murray, who oversees parks for the council, said: “This is an extremely distressing incident and we are working with the police to see if we can find who the owner of the dog was.
“We know there has been chat on social media about whether dogs should be on leads at all times in the park.
“The vast majority of dog owners are responsible and keep their dogs under control.
“But we would urge people to be mindful and take extra care when approaching other animals whether it be sheep in a field or a swan by a lake.
“Yarrow Valley is a huge park spanning 750 acres and any changes would have to be enforceable.
“If anyone has any information about this incident, they should contact the police on 101 and speak to police officer 3598, Rachel Jackson.”
More than 100 comments were posted on a local Facebook group.
Kerri Lou Lou Gibson said: “So sad. The dad swan will be heartbroken as swans mate for life. Stupid people letting their dogs off leads. It makes me angry.”