A baby found dead at an address in Sheffield died of stab wounds, according to a post-mortem.

Police were called to an address in Holywell Heights on Sunday following reports of concern for the safety of a newborn.

The infant was pronounced dead at the scene and seven people were arrested on suspicion of murder, aged between 15 and 38.

Now a forensic post-mortem has determined that the baby girl died as a result of stab wounds, South Yorkshire Police said.

Two of those arrested, aged 26 and 37, have since been bailed.

Police officers are still carrying out an investigation in the Holywell Heights area.

On Tuesday, a force spokesman confirmed a warrant had been obtained extending the length of time the other five people can be held in custody.

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Detective Chief Inspector Tom Woodward said: "We recognise this is deeply distressing for those who would have loved to have a chance to love this baby girl, for the emergency services who responded, and for the community who will inevitably be shocked by this incident.

"Everyone involved in responding to this tragedy - from the first officers and paramedics on the scene to the detectives now leading the investigation - has felt the profound impact of this investigation.

"Our commitment to this little girl is unwavering. We will confront every difficult and distressing challenge and pursue every line of enquiry with determination and care to secure justice for her."

Police have asked anyone with information to get in touch.