Police have arrested a fourth man in connection with the killing of nine-year-old Olivia Pratt-Korbel.
The 34-year-old, from Liverpool, was arrested on suspicion of assisting an offender after he was stopped by officers on the M42 in the Midlands, Merseyside Police said.
He is now being questioned by police.
It comes as three other men were arrested in the space of 24 hours by officers investigating the death of Olivia, who was shot in her home in Dovecot, Liverpool on August 22.
Olivia Pratt-Korbel, 9, was shot dead in her own home after a gun chase spilled over into her family’s house. Four men have now been arrested in the space of 24 hours in connection with the murder
A force spokesman said the vehicle the man was driving was seized following his arrest on Sunday evening.
Another 34-year-old man from Liverpool was arrested in the Runcorn area in the early hours of Sunday on suspicion of murder and attempted murder.
Two other men, a 41-year-old from Knowsley and a 29-year-old from Liverpool, are being questioned on suspicion of assisting an offender.
Warrants were executed at two properties in Liverpool on Sunday, police said.
Olivia was shot in the chest on August 22 by a balaclava-clad gunman, who was chasing a former burglar released from prison on licence in the Dovecot area of the city in a suspected gangland feud.
The killer was in pursuit of 35-year-old Joseph Nee, who forced his way into the house after noticing Olivia’s mother, 46-year-old Cheryl Korbel, had opened the door to see what was happening outside.
The gunman fired into the house hitting Olivia, her mother Cheryl in the wrist, and the fleeing 35-year-old in the upper body.
Joseph Nee, 35, forced his way into Olivia’s home in an effort to flee the gunman pursuing him after her mother opened the door to see what the noises outside were
Detective Chief Superintendent and head of investigations Mark Kameen said: ‘I continue to urge anyone who has information that can help our investigation into Olivia’s tragic murder to please come forward so we can bring those responsible to justice.
‘A number of people have been arrested in respect of this investigation.
‘However, we still need the public’s help in ensuring that we can a build a strong evidential picture so justice is served for Olivia and her family.
‘With this, I appeal for those who may have information, no matter how small, that could continue to help our inquiries to contact us directly or anonymously and we will do the rest.’
A 36-year-old man from Huyton and a 33-year-old from Dovecot who were arrested on suspicion of murder and two counts of attempted murder in relation to Olivia’s death have been released on bail.