Two more people have been arrested in relation to the death of Aya Hachem, 19, raising the total in police custody now to 13.
The men, aged 34 and 24, are from Blackburn and were detained on Thursday on suspicion of Aya’s murder.
They are in addition to another seven men and a woman who are also under arrest on suspicion of murder.
Three people - a man and two women - are detained on suspicion of assisting an offender.
A spokesperson for the police said: "We are still working hard to find who was involved in the killing of Aya.
"Thank you to those who have told us what they know and sent us video footage, it’s really helping us piece together what happened.
"Again, we ask that if you know anything or have info but haven’t been in touch with us yet, send what you know or have seen filmed via the Major Incident Public Portal at orlo.uk/C7NmJ."
Anybody with any other information is asked to get in touch on 101, quoting log number 0412 of May 18, or anonymously via independent charity Crimestoppers on 0800 555 111 or online at orlo.uk/Oztsg.
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