Five horses suffered serious slash wounds to their legs after a knife attack at rural stables.
The animals were found with severe cuts to their rear legs at Moat House Farm in Gorsey Lane, in between Bold in St Helens and Burtonwood in Warrington.
Merseyside Police are investigating the incident which happened between midnight and 4.30am last Friday.
None of the horses required veterinary care for their injuries.
Many attacks on animals are investigated by the RSPCA, but in this case, police are taking the lead to find those responsible.
A Merseyside Police spokesman said: "We were contacted at 5.15pm on Friday 17th July following reports that five horses at Moat House Farm in Gorsey Lane, Bold, had suffered cuts to their rear legs.
"None of the horses required veterinary assistance.
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"It is believed it happened between midnight and 4.30am on 17th July.
"Enquiries have been carried out in the local area.
"Anyone with information is asked to DM @MerPolCC or @CrimestoppersUK on 0800 555 111 quoting reference 20000421423
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