Three dogs have died and three more have received treatment after eating poison 'planted' in and around a north-west London park.
Two bull lurchers and a springer spaniel have so far died in three separate incidents around Fryent Country Park in Brent, including one where meat laced with poison was left in undergrowth.
Brent Police said the deaths were caused by a "nasty, cruel act", while the RSPCA said ingesting the poison "would have caused these dogs a great deal of suffering".
Lesley Hastings, whose six-year-old lurcher Toby died in a second incident after eating what is thought to have been rat poison, said whoever is behind the attacks was "malicious".
The Kingsbury resident told London24: “To lose a dog like Toby like this is so sad. He was a rescue dog and I had only had him for two years.”
“How do we know cats haven’t died too but their owners think they have just run away?” she added.
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A couple arrested over the death of an 11-month-old girl killed by a banned pitbull terrier type dog have been released on bail.
Ava-Jayne Corless was mauled to death by the dog while she was sleeping in bed at a house in Blackburn on Monday night.
The girl's mother, Chloe King, 20, and her partner, Lee Wright, 26, were held on suspicion of manslaughter.
"The two people arrested in connection with the death of Ava-Jayne Corless at Blackburn have both been released on bail pending further inquiries," Lancashire Police said.
Lancashire Police said the dog which mauled an 11-month-old girl in Blackburn has been identified by experts as a pitbull-terrier type dog, which is banned under the Dangerous Dogs Act 1991.
The RSPCA has issued the following statement after an 11-month-old girl was mauled to death at a home in Blackburn yesterday evening.
We are extremely saddened to hear about this incident and our thoughts are with the family of the baby girl involved.
Two years ago the RSPCA was contacted about a cat which had been attacked and died after going into a garden at this address. There was no suggestion that the incident was anything other than an accident and no further action was taken.
Later that year the RSPCA was again contacted regarding concerns for the health of a litter of puppies at the address. An officer attended and the dogs were all under veterinary care and receiving the treatment they required.
Two puppies were signed over to the RSPCA, which were subsequently found new homes.
There were no children living at the address at that time.
The dog that mauled a baby to death in Blackburn has been described as "very aggressive and dangerous" by a neighbour, who said the animal had previously entered his garden by breaking the fence.
Locals have claimed they reported dangerous dogs at the address of the killing to police.
Chief Superintendent Chris Bithell said Lancashire Police are making inquiries to see whether there have been previous issues with the dog, but that "at this moment it would be too early to speculate on that".
The mother of a baby mauled to death by a dog was downstairs with her boyfriend at the time, police have said.
Chief Superintendent Chris Bithell of Lancashire Police called the incident "absolutely horrific" and said both suspects will be questioned by detectives today.
The baby was upstairs in a bed in one of the front bedrooms and the two people who are currently in custody, they were downstairs when the attack took place.
The mother of an 11-month-old baby girl, mauled to death by a dog, has been arrested on suspicion of manslaughter.
Ava Jayne Marie Corless was in bed at a house in Emily Street, Blackburn, at around 11pm yesterday when she was savaged by what police described as an American pitbull-type dog.
She was pronounced dead in hospital a short time later.
The girl's mother has been named locally as Chloe King and the man in custody was named as Lee Wright, who is not the father of the child.
Police have not confirmed the names of those under arrest.
Neighbours claim to have made previous complaints about the dog's behaviour to police.
An 11-month-old girl mauled to death in Blackburn by an "American pitbull-type" dog has been named by Lancashire Police as Ava Jayne Marie Corless.
Her mother Chloe King, 20, and her partner named as Lee Wright - who is not the child's father - have been arrested on suspicion of manslaughter.