Three more people have been arrested over the death of the Lancashirelaw student Aya Hachem.
Aya, who was 19, was shot while on a shopping trip near her home in Blackburn last month.
A 32-year-old man from Coventry was arrested on Tuesday on suspicion of murder, along with a 32-year-old woman, also from Coventry, who was held on suspicion of assisting an offender.
Lancashire Police said a 28-year-old woman from Manchester was also arrested on Wednesday on suspicion of murder.
Last month, five men and one woman appeared at Preston Crown Court charged with Aya's murder.
Two men arrested remain on bail pending further inquiries, while six others were released under investigation.