Witnesses said the scene was chaotic. Multiple acts performed at two side-by-side nightclubs on the street as part of the annual music, film and interactive conference that draws tens of thousands to Austin each year.
Hours later, a pool of blood was still in the crosswalk with a trail leading to the sidewalk, bits of broken taillight mingled in and a medical glove nearby. People were already starting to filter in for the day's events and bands had started to play by early Thursday afternoon, and city buses took their normal route past the blood.
The driver, whose name also has not been released, faces two counts of capital murder and 23 counts of aggravated assault with a vehicle. Acevedo said it was an "intentional act," and that the suspect has been booked and formal charges will be filed this afternoon.
Two people were in critical condition Thursday morning with life-threatening head injuries and three patients remain in serious condition, said Dr. Christopher Ziebell, the emergency department director at the University Medical Center-Brackenridge said. He also said the driver was treated for minor injuries.
"The most critical patients I have a great deal of concern for," Ziebell said. "We are going to do our best for them, but these are some of the worst injuries that we see and not everybody with these kinds of injuries is going to survive."
No names of those killed or injured have been released.
Police said the incident started when an officer on a drunken-driving patrol tried to stop the silver Toyota sedan at a gas station a few blocks away. The car took off, weaving between parked cars then driving at high speed the wrong way down a one-way street.
The driver rammed through police barriers three wooden pieces held up by metal poles set up on Red River Street on the northeast edge of the entertainment district. It'd had been packed with revelers just minutes earlier, but officials had cleared the area to create a fire lane.
Austin resident Kirk Visser, 47, lives across the street from The Mohawk nightclub, where the bands X and TEEN had just wrapped up when the crash happened and rapper Tyler the Creator was scheduled to perform at 1 a.m.
Visser was watching TV when he heard the crash, and said he thought the nightclub's outdoor balcony had collapsed, so he stepped outside on his second-floor balcony.
"As soon as I stepped out, I knew I had heard metal on a body," he said. "There were people everywhere running and screaming."
Scott Jakota, a musician from Indiana in town to play SXSW, told the Austin American-Statesman he was one of the first people hit outside The Mohawk. He said the driver "gunned" the car.
"I was thrown up in the sky," Jakota said.
Next door to The Mohawk, Kurt Vile and the Violators were playing the outdoor stage at Cheer Up Charlie's. Ted Evans, a 29-year-old from New York City, said he heard what he thought was a gunshot. He made it out to the street a half-hour later.
"There was blood on the ground. I saw some people who had blood on their hands, and police were just trying to keep everyone calm," said Evans, who's working at the festival. He said the shows at both clubs were canceled within minutes of the incident.
The driver continued down Red River and hit a bicyclist, two people on a moped and a taxi at 11th Street before striking a van and trying to run away, Acevedo said. The second person on the moped was in good condition, he said.
Acevedo said authorities are still investigating, and asked witnesses and those who may have taken video to contact police rather than post it on the Internet.
The festival will continue, SXSW managing director Roland Swenson said Thursday morning. Festival spokeswoman Kelly Krause said there would be schedule and venue changes.
"It would cause more problems for people to show up and be turned away than to carry on," Swenson said.
One bouquet of flowers sat by a telephone pole in front of The Mohawk. Daytime concerts there and next door had been canceled, though festivalgoers were still showing up expecting to see bands.
Associated Press writers Chris Tomlinson in Austin and Andale Gross in Chicago contributed to this report.