Two teenage girls were killed in a crash on the M1 near Lutterworth.
The girls, aged 14 and 18, were passengers in a black Vauxhall Astra convertible which left the carriageway and went down the embankment between junctions 19 and 20.
The 35-year-old female driver and an 18-year-old male passenger were both treated for minor injuries.
No other vehicles were involved in the incident.
The vehicle was travelling northbound when the crash happened at about 7.15pm on Saturday.
The M1 was closed until the early hours of Sunday morning to enable the Serious Collision Investigation Unit (SCIU) to examine the scene.
Detective Constable Adrian Keebleof the SCIU said: “The car had gone about a mile past the start of the M6, Junction 19, and was travelling M1 northbound when it left the carriageway and collided with trees on the embankment at the side of the motorway.
“Sadly two teenage girls have died and we’d like to appeal to anyone who was driving on the M1 in this area on Saturday evening between 7pm and 7.15pm to contact us.
“The car was a black Vauxhall Astra but it was quite distinctive because it was a convertible so we’d like to hear from anyone who thinks they saw it.”
Anyone with any information is asked to contact Leicestershire Police on 101