A man and a woman have been arrested in connection to a motorway smash which killed a 12-year-old girl.
Sana Patel, who was from Blackburn, died at the scene of the incident, which happened at around 10.45pm on Saturday.
She was a passenger in a Nissan Qashqai which was involved in a collision with a Vauxhall Corsa, around a mile from junction eight for Chorley.
The occupants of the Vauxhall Corsa fled the scene on foot, Lancashire Police said.
A police statement said: "A short time ago we arrested a 23-year-old woman from Mirefield in Yorkshire on suspicion of death by dangerous driving. She remains in custody."
A later update said a 28-year-old man from Dewsbury, West Yorkshire, has been arrested on suspicion of causing death by dangerous driving and failing to stop at the scene.
The force said five other people in the Qashqai suffered minor injuries from the crash.
Detective Superintendent Andy Cribbin said: "This was a tragic incident in which 12-year-old Sana Patel lost her life and our thoughts are very much with her family and friends at his unimaginably difficult time.
"There are no words to describe what they will be going through and we send them our deepest condolences.
"We have now made one arrest but are very much still trying to establish what happened."
DS Cribbin appealed for more witnesses to come forward and urged any other occupants of the Corsa to get in touch with police.
The M61 was closed in both directions between junctions six and eight while collision investigators attended the scene.
It reopened on Sunday at around 9am.
