A fourth man was arrested on Sunday in connection with the murder of nine-year-old Olivia Pratt-Korbel.
The man, from Liverpool, was stopped almost 130 miles away from the city on the M42. He was driving on the motorway when arrested by police and the car he was in was seized.
The 34-year-old has been arrested on suspicion of assisting an offender on September, Sunday, 4, and he is in police custody.
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He was the fourth person to be arrested within the 24 hour period, after two other men, a 29-year-old man, from Liverpool, and 41-year-old man, from Knowsley, were also arrested on suspicion of assisting an offender.
A 34-year-old man, from Liverpool, has been arrested in the Runcorn area on suspicion of murder and attempted murder. All remain in police custody where he is being questioned by detectives.
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.
"The investigation into Olivia's tragic murder is ongoing and we still need to build up a strong evidential picture so that we can bring those responsible to justice. Anyone with information is asked to DM @MerPolCC or contact @CrimestoppersUK on 0800 555 111.
"If you have any CCTV/dashcam/smart doorbell footage that could help our inquiries they can be downloaded on the dedicated public portal for Olivia's murder, which will go straight through to the investigation team. Footage can be submitted here Public Portal ( mipp.police.uk )."
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