Here is What We Know: A 17-year-old girl, who's condition is now stable, was rushed to Southampton General Hospital after the incident in Fratton at around 7pm last night
A manhunt is underway after the teenage babysitter was left with life-threatening injuries following a brutal hammer attack. Latest reports say her condition has improved and her condition is now "serious but stable".
The girl, named local as Louise, is understood to have worked as a babysitter for the owner of the property, who ran to a nearby corner shop to call for help when the man forced his way inside.
Pratik Brahma, who owns Shearer Convenience Store said, "I was just closing the shop when the lady came running in saying someone had got inside her house and she needed to call the police.
"She was very frightened and saying 'somebody help me, he's in my house with a hammer'. She told me the girl who was attacked had opened the door and the guy had got inside.
"The girl lives nearby and looks after the lady's dogs. She's a very nice girl, always smiling, the whole community is in shock."
The attacker, who has been described by witnesses as a young male wearing a brown jumper, fled the scene before police arrived.
The woman's three-year-old daughter was also in the house at the time of the incident.
Local resident Donna Sears told us the girl was, "attacked with a hammer in a friend's house down the road by a bloke, he knocked the door and ran out leaving her in a very bad way.
"It was not nice at the time, the child was with us in the shop. Hope the girl comes through the attack. I keep picturing her face it's awful, deepest prayers for this young girl," she added.
Retired Leonard Pike, 81, who lives just a few doors down from where the attack took place, said, "The woman who lives there has two young children, I'm sure the girl who was attacked wasn't her child.
"It's baffling, really, I can't understand why someone would set about someone like that. I don't know what the reason is but its uncalled for and disgusting."
Another neighbour, who asked not to be named, said, "She (the victim) doesn't live there but I know her to say hello to and she's a very nice girl.
"I didn't realise anything had happened until the police and the ambulance arrived but it's truly shocking to have something like this happen on your road."
The victim's condition has improved to 'serious but stable' after being taken to the specialist neurological unit at Southampton General Hospital last night with injuries too severe to be treated at QA.
Officers are currently trying "to locate all parties believed to have been involved in the incident". Uniformed officers carrying flashlights scoured the grounds of nearby St Mary's Church, neighbourhood bins and conducted door-to-door enquiries last night.
So far no-one has been arrested.
A spokeswoman for South Central Ambulance Service said that the teenage girl has suffered life-threatening injuries. "We were called at 7.06pm last night to reports of a female who had been assaulted and was found to have suffered life-threatening head injuries.
"She was assessed and treated at the scene and then taken in a land ambulance to Southampton General Hospital."
A Hampshire Police spokesman said, "Officers were called at 6:58pm on Monday to a report of a serious assault inside an address on Shearer Road in Portsmouth.
"A 17-year-old girl had been assaulted with a weapon believed to be a hammer, leaving her with a serious head injury.
"She has been taken to Southampton General Hospital where she remains in a serious but stable condition."
Enquiries are ongoing to locate all parties believed to have been involved in the incident.
Anyone with information can call police on 101 quoting crime reference 441 6013 7858.