Police have arrested another person in connection with the murder of Liverpool schoolboy Rhys Jones.
A 20-year-old man is being held by officers in addition to 12 people arrested on Tuesday over the killing in Croxteth in August 2007.
A total of 11 of those remain in custody and four are being held on suspicion of murder.
A 22-year-old man held on suspicion of perverting the course of justice was released on bail on Tuesday night.
Officers were given an extra 12 hours to question the 11 already in custody and now have until 1900 BST to hold them.
Eleven-year-old Rhys was shot in the neck by a gunman on a bicycle as he walked home from football training in Croxteth Park last August.
On Tuesday officers from the Merseyside force arrested nine males and three females, aged between 15 and 54, following a series of dawn raids.
Two youths, aged 16 and 17, and two men, aged 24 and 25, were being held on suspicion of murder.
A 16-year-old boy was arrested on suspicion of assisting an offender, attempting to pervert the course of justice and possession of a firearm and ammunition.
A 49-year-old man and a 15-year-old boy were arrested on suspicion of assisting an offender and attempting to pervert the course of justice.
A youth, 17, is also being held on suspicion of assisting an offender.
The three women, aged 50, 54 and 21, have been arrested on suspicion of attempting to pervert the course of justice.
Detectives, who believe Rhys was not the intended target of the gunman, had previously arrested 20 people since the killing on 22 August, including 17 on suspicion of murder.