COPS have arrested a 34-year-old man on suspicion of the murder of nine-year-old Olivia Pratt-Korbel in Liverpool.
The youngster was shot when a gunman chased convicted burglar Joseph Nee into her home on August 22.
A bullet passed through Olivia's mum's wrist before striking the youngster in her body - fatally wounding her.
She was rushed to hospital but declared dead later that night.
Officers last week had been searching at West Derby Golf Club where searches for the two guns used in the attack.
Cops have now arrested ten people in total in connection with her killing.
The previous nine were all bailed and no one has yet been charged.
A spokesperson for Merseyside Police tonight said: "The investigation into Olivia's murder is ongoing and we continue to appeal for people with information to come forward to assist us in bringing those responsible to justice."
Lord Ashcroft last week pledged a £50,000 reward through Crimestoppers, of which he is chairman for information that leads to her killer being jailed.
It comes after Olivia's mum issued a heart-breaking appeal to find her daughter's killer - telling them "you know you have done wrong".
With her hand wrapped in a bandage from the night she lost her daughter, Cheryl said: "She was amazing, she loved life. She was my little shadow. She went everywhere with me.
"She didn't like school because she had to do work but she loved it because she was with all her friends.
"Everyone that she met they all fell in love with her.
"She left a mark on everyone that she met and she may well have only been nine but she packed a lot in them nine years.
"She never, ever stopped talking. And that is what I miss the most, because I can't hear her talk.
"I am hoping that they come forward so this doesn't happen to anybody else.
"You know you have done wrong so you need to own up like I have taught my kids. You do something wrong, you own up to it."
It comes as Olivia's classmates received counselling after returning to school following her death.
Rebecca Wilkinson, headteacher of St Margaret Mary's Catholic Junior School in Huyton, said: "What has been nice since the children have come back are the memories that they have shared from what they remember of Olivia and, in what has been a sad three weeks, that has been really heartening, to listen to the memories that the children have shared of her.
"That's brought a lot of happiness really in what is a very tragic situation, listening to those memories."
The school's 480 pupils have been offered counselling since returning following the summer holidays.
Anyone with information can contact Crimestoppers on 0800 555 111 or crimestoppers-uk.org.
