Detectives have made another arrest in connection with the murder of Olivia Pratt-Korbel in Liverpool.
The 40-year-old man from Dovecot was arrested on suspicion of assisting an offender on Friday.
It comes a day after a 34-year-old man was arrested on suspicion of the nine-year-old girl's murder.
The arrest of the 40-year-old is the 11th in the investigation so far. He remains in custody at a police station for questioning.
The nine other people previously arrested have all been released on bail, and no one has been charged.
Olivia was shot dead in Dovecot on 22 August after convicted burglar Joseph Nee forced his way into her home while running away from a balaclava-clad gunman.
The girl was hit in the chest after the attacker opened fire from outside the property. Olivia's mother was injured after being struck in the wrist by the same bullet.
Her death was one of three fatal shootings within a week in Liverpool, with Ashley Dale shot dead in her back garden on 21 August and 22-year-old Sam Rimmer gunned down in Dingle on 16 August.
Police said on Wednesday that officers had spent 15,000 hours on the Olivia case, that there were 2,000 exhibits, and that thousands of hours of CCTV had been looked at.
The man who was chased and shot by the killer remains in hospital.
Last week, it was announced a £200,000 reward was being offered for information leading to the conviction of those responsible.
It is the biggest reward in Crimestoppers' history.
The latest arrest comes after police investigating Ms Dale's murder released images of a vehicle that was seen in the area before she was shot.
Anyone with information about Olivia's murder is asked to DM @MerPolCC or contact @CrimestoppersUK on 0800 555 111 with reference 22000621096.