People at the scene of the hit-and-run in Austin posted updates and photos to social media from outside Mohawk bar downtown.
A car plowed into a crowd early Thursday morning, killing two and injuring as many as 23 people. The driver tried to flee the scene but is now in police custody.
Austin is hosting the South by Southwest festival, drawing thousands of people.
"I'm witnessing one of the darkest things I've ever seen right now. Tragedy at SXSW. Outside the X show at Mohawk," one person tweeted.
After the incident, people tweeted photos and video of ambulances and police arriving.
This morning, people on Twitter shared their condolences.
The Austin Police Department is asking witnesses of the incident to call (512) 974-5186.
Follow @JolieLeeDC on Twitter.