SAN DIEGO (CNS) - A 9-year-old girl suffered a fractured femur when her 16-year-old sister fell off the dockless electric scooter they were both riding on and the scooter crashed into a tree in the City Heights area, police said Tuesday.

It happened shortly before 7:35 p.m. Monday in the 4200 block of Dwight Street, San Diego police Officer John Buttle said.

The 9-year-old girl and her 16-year-old sister were riding on a dockless electric scooter, with the younger girl closest to the handlebars, eastbound on the south sidewalk of Dwight Street, Buttle said.

The older girl fell off the scooter, causing the younger girl to lose control of the scooter and crash into a tree, Buttle said.

The victim suffered a fractured femur and was transported to a hospital, Buttle said.