A play park in Cheshire has been cordoned off by police after a pool of blood was found in the early hours.
Officers and police dogs have searched Pownall Park in Wilmslow but nothing significant was found, a police spokeswoman said.
The blood has been sent away for analysis, to determine whether it is from a human or animal.
Police have appealed to anyone who knows how the blood came to be in the park to contact them.
They said the area would be cordoned off while investigations are ongoing.