CHATTANOOGA, Tenn. -- A school bus driver charged with vehicular homicide in a crash in Tennessee asked the children if they were ready to die, according to the mother of three kids who were aboard the bus.
My daughter said right before the bus flipped that he was speeding around the curve and asked them ‘Are y’all ready to die,’”Jasmine Mateen told CBS News correspondent Mark Strassmann.
Mateen's 6-year-old daughter was one among the five dead.
She also said she had complained repeatedly since August about the behavior of driver Johnthony Walker before the accident, to no avail. Officials have not confirmed or commented on Mateen’s account.
According to the arrest report, Walker was going "well above" the posted speed limit of 30 m.p.h. before the fatal crash that killed five elementary school children on Monday.
The 24-year-old man was arrested on five counts of vehicular homicide, reckless endangerment, and reckless driving.
Four girls and one boy from Woodmore Elementary School died, Hamilton County Interim Superintendent Kirk Kelly confirmed Tuesday morning. Twelve students remained in the hospital, Kelly added.
Police determined Walker was driving at a high speed on the narrow winding road, based on witness statements and physical evidence.
Photos: Multiple children killed in Tenn. school bus crash
The report stated Walker lost control of the bus and swerved off the right side of the road, striking an elevated driveway and mailbox, then swerved to the left and the bus began to overturn and hit a telephone pole and a tree.
"Because of the reckless nature of Mr. Walker's driving, combined with his very high speed and weaving within his lane, Mr. Walker was charged with five counts of vehicular homicide by recklessness, reckless endangerment, and reckless driving," the report said.
Walker's bond is set at $107,500.
Six kids remained in ICU as of Tuesday morning, according to a school district official.
The police chief said more charges may be added as the case proceeds to a Hamilton County grand jury.
"This is an absolute nightmare for our community, for police, for partners, but I can ensure you we are prepared and trained to make sure this is investigated thoroughly and we're making sure we have all the resources families, the schools and the communities need to respond to this tragedy and trauma of this grieving loss," Fletcher said.
Fletcher confirmed that five children died at the scene of the crash, which happened just before 3:30 p.m. Monday.
Fletcher said the bus, which was carrying 35 kindergarten through fifth grade students from Woodmore Elementary School, was the only vehicle involved in the crash. The bus left the road and struck a tree, he said.
Fletcher said they were still working to reunite some children with their families as of 11:30 p.m. Monday.
"We are working diligently to ensure all children who got care at the hospitals or may have been transported are reunited successfully with their families," Fletcher said.
The National Transportation Safety Board has said they are sending a team of investigators to Chattanooga Tuesday morning.
Woodmore Elementary will be open for school Tuesday, the Hamilton County Department of Education said on Facebook. Grief counselors will be at the school for students and staff.
"If parents feel it necessary to keep their students home from Woodmore Elementary, we understand, but want to once again remind you extra trained personnel will be there to counsel and aid anyone seeking assistance in dealing with this horrible tragedy," the post said.
PREVIOUS: Police in Chattanooga have confirmed that multiple children were killed in a crash Monday afternoon involving a school bus filled with elementary school children.
As of 6:30 p.m., District Attorney Neal Pinkston said there 6 fatalities, which included five deaths at the scene and one at the hospital. However, Chattanooga Police say they can not confirm that number.
"We do know that multiple children lost their lives today in this tragic incident," Chattanooga Police Chief Fred Fletcher said.
He said they were not releasing numbers of fatalities or injuries because the crash is "still an active scene."
“When we know how many children lost their lives, when we have talked to their families personally, when I have talked to their families personally, then you will have a number and not a minute before,” Fletcher said.
While the investigation into the deadly crash is just getting underway, Fletcher said it appears one contributing factor may be the bus speed.
“Right now, it appears that one contributing factor may be speed, but that is part of an active, ongoing investigation," Fletcher said.
A warrant has been issued to remove the informational box on the school bus and review it.
The National Transportation Safety Board said on Twitter that they are launching an investigation of the crash, and a team of federal investigators will deploy to Chattanooga Tuesday morning.
Chief Fletcher said the bus driver is cooperating with questioning. Investigators are still on the scene of the crash gathering evidence as of 8:15 p.m.
"It is a complicated crime scene that covers a significant area," Fletcher said.
The chief said his top priority was taking care of the children who are injured and hurting. The second priority is helping the families of the deceased.
Officials said there were 35 students from Woodmore Elementary on board and 23 patients were transported to the hospital after what was described as a "horrible" crash that happened just before 3:30 p.m. The students are all between kindergarten and fifth grade.
The bus was the only vehicle involved in the crash. The bus turned over on its side and struck a tree, Fletcher said.
The crash comes nearly two years after a deadly school bus crash in Knox County. That deadly December 2014 crash killed two young students and a teacher's aide.
"A bus crash involving school children is every public safety professional's worst nightmare. But it's also the thing that we all train for and you have police, fire, EMS, and our partners out here doing everything they can to rescue victims and support the families of those who've already been treated," Fletcher said.
Chattanooga blood donation centers put out a plea for donations following the deadly crash.
The community quickly answered that call.
Dozens were seen waiting in line to donate blood at one of the centers, according to a reporter from the NBC-affiliate WRCB.
The Chattanooga Fire Department said around 5:30 p.m. that the last patient was extricated from the bus.
The school bus driver is cooperating with police and their investigation, Fletcher said during a press conference.
Tennessee Highway Patrol Colonel Tracy Trott sent his condolences to the families.
"My heart goes out to the families of the children that were killed & injured in the school bus crash in Chattanooga this evening," Trott tweeted.
The fire department described it on Twitter as "very serious" and Chattanooga's mayor called it "horrible."