A three-year-old boy has died after he was bitten by a dog in Essex.
Police said it happened at a property in Parker Way, Halstead, at 17:40 BST on Thursday.
An air ambulance was called to the scene and the boy was airlifted to Addenbrooke's Hospital in Cambridge.
Essex Police said a 29-year-old woman had been arrested for allowing a dog to be dangerously out of control. The dog has been seized by police and placed in kennels.
Live updates: Boy dies following dog bite
Neighbour Phyllis Younger heard the boy's screams.
"I heard this screaming," she said. "I did not really associate it with anything terrible - it was like children having a bit of fun. But then I thought it might not be quite right.
"Then it was quiet. I looked out of the window and saw a police car and paramedics and neighbours looking along the road."
Mrs Younger went outside and asked what had happened.
"They told me the dog had attacked the little boy and he was in a bad way."
She said the family involved had not lived in the street for very long and "kept themselves to themselves".
Shirley Diver, mayor of Halstead, said the incident was heartbreaking.
She said: "It's dreadful news, it really is. I've had dogs all my life and I don't think you can ever trust a dog 100% with any child.
"It's so sad. I feel so sadly for the family who are involved. Words can't express how it affects anybody. The whole town is in shock."
Braintree MP James Cleverly was briefed about the incident by police.
He said: "I have got children of my own, and this is both shocking and heartbreaking. For any parent, this is the most terrible news.
"This will be an absolute body blow to everybody in the town."
At the scene: Chris Flynn, BBC Essex
I have been told Parker Way is usually a quiet street.
But today, it is unusually sombre.
There is an address here which is cordoned off. Within the cordon, forensics officers are at work collecting evidence.
Representatives of the local and national media are walking up and down the street, knocking on doors and quietly talking to people in the street.
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