Zyanna Harris, 10, Zoie Nash, 9, Zyaira Mateen, 6, D'Myunn Brown, 6, Cordayja Jones, 9, and Keyonte Wilson, 8, killed, many children injured, and driver arrested after high-speed school bus crash in Chattanooga, Tennessee

At least six people were killed and at least 23 children taken to the hospital after a school bus crashed into a tree Monday afternoon in Chattanooga, authorities said.

Colonel Tracy Trott of the Tennessee Highway Patrol tweeted that children were both killed and injured.

Many politicians, agencies and individuals expressed their grief for the tragic incident on social media. 

Police said the driver of the bus, Johnthony Walker, 24, has been arrested and a warrant has been issued to remove the black box from the bus and review evidence on the bus's video cameras. Kelly said this morning the school would cooperate with the investigation.

Walker has been charged with five counts of vehicular homicide, reckless endangerment and reckless driving. He is being held on a $20,000 bond. A preliminary court date has been set for Nov. 29.

Now, some Tennessee lawmakers want to make it mandatory to have seat belts in school buses. Similar legislation was considered in late 2014 and early 2015, but did not make it onto the floor for a vote. Lawmakers from the Chattanooga area are pushing for legislation, and at least one lawmaker in Shelby County has promised similar support in wake of this deadly accident.

As of Tuesday afternoon, 12 patients from the school bus crash remained at the hospital, including six in critical condition and six in stable. 

“The most unnatural thing in the world is for a parent to mourn the loss of a child,” Mayor Andy Berke said. “There are no words that can bring comfort to a mother or a father. So today, the city is praying for these families.”

The private company that owned the bus involved in Monday's fatal wreck in Chattanooga that killed five elementary school students has had 142 crashes with injuries and three fatalities in the last 24 months, according to federal records.

CBS News Correspondent Mark Strassmann spoke to a mother who had three children on the bus, one of whom died. The mother says that her other two children told her that just before the crash, the bus driver asked the children if they were ready to die.

“The mother says that in the moments before the crash, the bus driver said something to the effect of ‘Are you all ready to die?’ and then seconds later, the bus was on its side and five kids were killed,” said Strassmann.

The child’s death comes after the National Transportation Safety Board (NTSB) announced the road where the bus crashed was not part of the designated route.

Honorable Christopher Hart, chairman of the NTSB, said they’ve also looked into the history of Talley Road, which isn’t far from the children’s school Woodmore Elementary.

The Chattanooga Police Department tweeted[1] the new death toll Wednesday night, saying "another child in the bus crash has passed away."

The child, who is now the sixth victim of the crash, has not been identified by police, but ABC-affiliate WTVC learned his name is Keyonte Wilson. He was 8 years old.

He said Walker, who has no criminal record in the state, had taken on a second job at an Amazon Fulfillment Center, and part of the agency’s investigation will look at whether fatigue played a role in the wreck.

People across the state have come together to help the families who lost children in the Chattanooga school bus crash.

Funeral services, family member travel-related expenses to attend the funeral, counseling for family members, parents, and members of the Woodmore Elementary School staff, hospital expenses for students involved in the crash, and medical expenses related to the crash for up to six months from the date of release from the hospital will all be covered by Durham.

The same day a student wrote that the driver "drives too fast. It feels like the bus is going to flip over." The student also said the driver would cause the students to hit their heads by stopping quickly.

Funerals were held in Chattanooga, Tennessee, this weekend for two of the six children killed last week[1] in a school bus accident.

David Duke, the CEO of bus contractor Durham School Services, has said there was nothing alarming enough in Walker’s file to merit termination before the Nov. 21 crash.

News outlets report that a lawsuit filed Wednesday in Chattanooga federal court accuses Hamilton County Schools, district Transportation Supervisor Ben Coulter and Durham School Services of failing to take reasonable precautions to prevent the Nov. 21 crash and being "deliberately indifferent" to the students' constitutional rights.

A defense attorney for the driver in a Tennessee school bus crash that killed six elementary school students in November says the bus driver swerved to avoid a collision with a second vehicle.     

 A Tennessee school bus driver was on his cellphone and driving 20 mph over the speed limit when he caused the crash that killed six elementary school students, a prosecutor said in court today.

During Walker’s trial this week, a video from the bus was played in court that appeared to show Walker with his phone in hand as children boarded the vehicle.