Two girls were badly hurt in a crash involving a car and an e-scooter in West Derby.
Both were taken to hospital with what police described as "serious" injuries.
Their conditions have since stabilised.
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Emergency services were called to Alder Road just after 7.30pm on Sunday.
Police and paramedics attended following reports of a crash between an Audi and an e-scooter the girls, both aged 15, were riding.
The driver of the Audi stopped at the scene and assisted officers with their enquiries.
Alder Road was closed off for two and a half hours following the crash.
A Merseyside Police spokesman said: "We can confirm that emergency services were in West Derby following a serious road traffic collision last night, Sunday, July 11.
"At around 7.40pm, officers and the ambulance services were called to the junction of Alder Road and Chatterton Road to reports of a collision between an Audi and an E-scooter. Two females on the scooter were taken to hospital with serious injuries and are now in a stable condition.
"The road was closed until 10.20pm and enquiries are ongoing to establish the circumstances.
"The driver of the car stopped to assist police."
Anyone with information, dashcam or other footage is asked to contact Merseyside Police's roads policing unit by calling 0151 777 5747 or emailing rpiu@merseyside.police.uk.
You can also contact the force via Twitter (@MerPolCC) or Facebook (Merseyside Police Contact Centre).
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