A 20-year-old man has been arrested on suspicion of murder after two teenage girls died when they were hit by a car.
Jasmine Allsop, 14, died at the scene in Ann's Hill Road in Gosport, while Olivia Lewry, 16, was taken to hospital but also died, Hampshire Police said.
Detective Superintendent Dick Pearson said: "This is an extremely tragic incident which has resulted in the death of two young girls.
"I currently have a team of detectives and other officers, including expert road collision investigators, working on this case to fully investigate the circumstances surrounding the deaths of these two teenage girls.
"I would appeal to anyone who knows anything which could help this investigation to contact my team as soon as possible."
The girls were pedestrians and were involved in a collision with a green Honda Civic car which was being driven along the road at about 4.15am on Sunday.
The older girl was taken to the Queen Alexandra Hospital in Portsmouth with serious injuries but did not survive.
A man was originally taken into custody on suspicion of causing death by dangerous driving but the offence was later changed to suspected murder, police said.
He remains in custody.
A bouquet of flowers placed near the scene read: 'In loving memory of Olivia and Jaz, thinking of you lots of love.'
One local resident Aaron O'Sullivan told the Portsmouth News: "It's horrible what a waste of life, especially coming up to Christmas, it's just shocking."
Sky News reporter Siobhan Robbins spoke to some of the girls' friends, saying they described them as 'outgoing and bubbly'.
One local resident Daniel Close said: "It's tragic. It's got to be the worst news you can get."
Anyone with any information is asked to contact the Major Investigation Team at Fratton Police Station on 101, quoting Operation Barb.