A 34-year-old man has been arrested on suspicion of the murder of Olivia Pratt-Korbel who was shot in her home in Liverpool.
Olivia, nine, died after being shot in the chest as her mother tried to stop a gunman entering their home in Dovecot on 22 August.
Her mother, Cheryl Korbel, 46, was injured as the gunman chased convicted burglar Joseph Nee into their property at about 10pm.
Merseyside Police say the suspect, who is from Dovecot, was arrested on 29 September, and has been taken to a police station to be questioned.
A 40-year-old man was later arrested, on 30 September, on suspicion of assisting an offender.
He has also been taken to a police station for questioning, making him the eleventh arrest made to date.
Officers said the investigation into Olivia’s murder is ongoing and continues the appeal for information.
The reward offered in the hunt for the killer had been increased to £200,000.