A 28-year-old woman has been arrested after a 10-year-old boy was killed by a dog in Caerphilly.
Gwent Police has arrested a woman on suspicion of being in charge of a dog dangerously out of control causing injury resulting in death.
Jack Lis was mauled to death at the home of a friend in Pentwyn, Penyrheol, on Monday.
Chief Superintendent Mark Hobrough said: “As we’ve arrested an individual on suspicion of an offence linked to the attack, and spoken to two others voluntarily, we’re looking to identify where any criminal matters have occurred.
“I understand that there is a lot of interest about this in our communities. It is vital that people are considering the tone and language used in comment posted on social media about the identities of anyone involved in this matter as part of our inquiries.
“As this is a live investigation, such comments may have an impact on our ability to bring anyone found to have committed a criminal offence to justice.”
Jack's mother paid an emotional tribute to her son on social media describing him as her "sweet, sweet boy".
"With so much heart break and before friends and family see his name in the news, I have to announce our beautiful boy Jack was taken so tragically yesterday," she wrote.
"It was not our dog nor did it happen in our family home. He was out to play."
Jack and his friend were alone when the attack happened.
Jack’s friend sought the help of a neighbour who lived several doors down on the same street, but the man was unable to stop the dog.
Paramedics arrived at the scene just before 4pm. The dog was shot dead by firearms officers on the scene.