North Las Vegas authorities told residents Tuesday to be patient -- they're still investigating.
At a news conference, Mayor Shari Buck and the North Las Vegas Police Department declined to identify the drivers involved in two high-profile pedestrian accidents in the past few weeks.
The names of the drivers are expected to be released in several weeks, police said. Neither driver has been charged with a crime.
On Thursday, a 16-year-old girl was run over by a school bus that rolled through a stop sign at Brooks Avenue and Berg Street.
Police spokeswoman Chrissie Coon said that the girl remained hospitalized in serious condition and that doctors did not have to amputate her leg.
Coon did not identify the girl, but the Review-Journal has learned she is Linda Sida, a Canyon Springs High School student.
The 51-year-old bus driver has been suspended with pay by the Clark County School District, sources said.
On Oct. 21, three girls were injured when they were struck by a vehicle in a crosswalk at Camino Eldorado and Bent Arrow Drive.
Amelia "Mia" Decker, 6, died from injuries suffered in the crash.
Six-year-old Rain Mowery was treated for a fractured skull and released from the hospital. Her sister, 5-year-old Alyssa Mowery, remains hospitalized with critical injuries.
The 78-year-old driver who struck the girls did not brake, and the vehicle carried one child almost 150 feet, North Las Vegas police said.
Buck used the news conference to reiterate that drivers and pedestrians need to use extra caution on valley roadways.
"Enough is enough. Be a better driver," she said.
Reporter Trevon Milliard contributed to this report. Contact reporter Mike Blasky at firstname.lastname@example.org or 702-383-0283.