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CHATTANOOGA, Tennessee (CNN) – The fatal accident that killed five children in Chattanooga was actually the second time in two months driver Johnthony Walker crashed a school bus.

In September, Walker was driving around a blind curve in a residential area when he failed to yield the right of way and sideswiped another car, according to the accident report.

Walker “crossed over into the oncoming traffic lane to maneuver the bus through the curve and struck vehicle #2 in doing so,” the report states. “There were no children in the front rows, and no reports of any injuries. The damage (was) minor to both vehicles.”

Now, investigators are trying to determine why Walker was driving “well above” the speed limit Monday when the bus crashed and flipped on its side.

And as 12 children try to recover in a hospital — some with severe head or spinal injuries — the families of five children will have to spend their first Thanksgiving without them.

Children were ‘just hollering and screaming’

The school bus swerved off Talley Road, plowed into a tree and split apart — just outside Mary Smith’s home.

Smith darted outside her house when she heard the wreck.

“I ain’t never heard nothing like that before in my life,” she told CNN affiliate WKRN. “The wheels were still turning on the bus.”

In the chaos, Smith tried to help children who had been thrown out of the bus. A little boy was trying to find his shoe, she said. Another was trying to find his sister.

“They were just hollering and screaming, all of them in a different tone,” she said.

By Wednesday, shock gave way to mourning. Crowds had gathered at the makeshift memorial, the elementary school and church — to process, pray and grieve.

Chief: ‘Driving was reckless and unsafe’

Walker received his commercial driver’s license in April, the NTSB said.

His school bus left Woodmore Elementary School on Monday afternoon with 37 students. It did not make any stops before the crash, NTSB Chairman Christopher A. Hart said Tuesday.

The bus was heading down a narrow, winding road well above the speed limit of 30 mph, according to an arrest affidavit for Walker.

“Mr. Walker lost control of the bus and swerved off of the roadway to the right, striking an elevated driveway and mailbox, swerved to the left and began to overturn, striking a telephone pole and a tree,” the affidavit says.

Chattanooga Police Chief Fred Fletcher told HLN the “driving was reckless and unsafe for conditions at the time.”

Walker’s blood sample has been sent to state lab for processing, he said.

The bus did not have seat belts.

Grandmother of victim: ‘I ain’t accept it yet’

Of the five children who died, three were fourth-graders, one was a first-grader and one was a kindergartner.

Zakiyyah Mateen still can’t process the death of her 6-year-old granddaughter, Zyaira Mateen.

“That was my baby,” she said Wednesday. “I ain’t accept it yet.”

She described Zyaira as a “feisty” little girl.

“Everybody loved her. She’s a good little girl, so sweet and smart.”

Another victim was D’Myunn Brown, 6. His mother had met him at the bus stop each day and so she knew exactly where he sat.

“He was my only child,” Diamond Brown sobbed.

Brown had recently returned home to D’Myunn after serving a five-year prison sentence. D’Myunn was just 1 year old when his mother went away.

Bus driver’s mother asks for compassion

The driver now faces five counts of vehicular homicide, as well charges of reckless endangerment and reckless driving.

After the crash, Walker’s mother said she got a phone call from her son, who told her he’d been in a “drastic accident” and tried to explain what had happened before police took his phone away.

“He was trying to get them (children) off the bus — all the bodies were limp,” Gwenevere Cook said. “There was blood everywhere. He has been cooperating with the police. He texted me minutes later saying the kids are dead.”

Cook offered her condolences to the victims’ families and asked for compassion for her son. She said Walker is a respected man and the father of a 3-year-old son. He worked two jobs and had never been in trouble before.

“It is a horrible nightmare,” Cook said. “I feel bad for my son, and I am torn up for the (victims’) family members.”

Questions about the bus company

The company that operated the bus and employed Walker has also come under scrutiny.

Durham School Services, a company that transports more than 1 million students daily at schools across the United States, said it was working with police and school officials to investigate.

Neither the city of Chattanooga nor its schools interacts with the company, Chattanooga Mayor Andy Berke said. Hamilton County runs the bus system.

“Our entire team at Durham School Services is devastated by the accident yesterday that tragically claimed the lives of Chattanooga students,” the company’s statement said.

Chattanooga in mourning

Hundreds of mourners filled the pews at New Monumental Baptist Church on Tuesday night. They cried and raised their hands in prayer as they sang of how God is in control, and that no matter how bleak the situation, things will get better.

“We love the children of Woodmore with all our hearts,” Hamilton County Interim Superintendent Kirk Kelly said. “We will grieve together and honor our children’s lives.”

A survivor of the crash hobbled to the front of the sanctuary in crutches, bringing the tearful crowd to its feet.