Police have arrested a 34-year-old man on suspicion of the murder of Olivia Pratt-Korbel.
Nine-year-old Olivia was shot in the chest at her home in Dovecot, Liverpool, on August 22.
Her mother, Cheryl Korbel, 46, was injured as the gunman chased convicted burglar Joseph Nee into their property at about 10pm.
Merseyside Police said on Thursday evening that a man from the area has been taken to a police station where he will be questioned by detectives.
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.
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