They said as soon as the gunfire started, people began running for their lives.
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Seven people and more than 30 were injured after a shooter opened fire on the parade from a rooftop around 10 a.m. Monday.
Highland Park parade shooting victims' family recalls harrowing day
Robert "Bobby" E. Crimo, III was identified as a person of interest in the shooting. He is charged with seven counts of first degree murder.
Two days into their marriage, Matt and Brooke Strauss placed their wedding flowers near the scene to honor the victims.
"This is just, it's tragedy! It's a tragedy. It's really hard to be here right now," Brooke Strauss said.
VIDEO: People flee as shots fired at Highland Park parade
VIDEO: People flee as shots fired at Highland Park parade
Signs of the carnage still lay untouched near the epicenter of the gunfire at Central and 2nd. Parade-goers left their belongings behind as they ran for their lives.
Howard Prayer said while he was trying to evacuate the downtown area, he saw the suspect speeding away.
"I saw the person. I thought it was a woman at first because it was long, dark hair and then I realized that's the shooter," he said.
"There are no words to describe what happened yesterday," said witness Zachary Katznelson. "I was in the front and a few minutes before the shooting happened, I was right where it was. I just feel so lucky. I have some of that luck guilt that it could've been me. It could've been any of us in the band."
WATCH: VP Kamala Harris speaks in Highland Park after deadly parade shooting
VP Kamala Harris speaks in Highland Park after deadly parade shooting
"Hold each other tight as a community. Know that you have a whole nation that stands with, but it's not going to undo what happened," the vice president said.
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Harris met with city and state leaders, joined by the Second Gentleman, and spent time with first responders and police before speaking briefly to the public.
Earlier the attended the National Education Association's annual meeting in Chicago. She echoed the call for more gun reform laws in America, including taking away access to assault weapons.
Grief counselors have been stationed at Highland Park High School to help the community.
"It was definitely beneficial. The therapist gave us strategies such as thinking of that place where we feel at our center, or happy," Katznelson said.
But the road to healing will likely be a long one.
Loving grandfather, lifelong synagogue member among shooting victims
One witness said "it looked like a war zone," and he was almost trampled in the stampede after the shots were fired.
"This should not happen in our country," Paul Chesler said.
"All I thought about was getting my daughter to safety, I ran with her, we went to the nearest McDonalds and she lost her shoe along the way, she was scared, all I just wanted was her to be safe," said Armani Garcia. "She was in front of walker brothers, she was gonna come sit next to us. I'll have the girls cross over. They never made it across. The parade was going on and that's when everything happened."
WATCH | 'Bodies were blown up by AR-15s': Dr. David Baum describes parade shooting
'Bodies were blown up by AR-15s': Dr. Baum describes parade shooting
Dr. Wendy Rush was at the parade and attended to the wounded.
"We heard the gunfire and then it stopped and multiple people, everybody was jumping into action," Dr. Rush said. "People identified themselves as physicians, as nurses, anyone who could help, had special skills. In our field as an anesthesiologist, we have very specialized skills managing breathing for people. We are very well trained in CPR and advanced life support and starting IVs and people were just helping all over."
For three hours, Donald Johnson hid in a gas station.
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"There were six or seven children crying their eyes out, and the mothers finally got them settled down by singing 'The Wheels On The Bus Go Round and Round,'" he said.
President Joe Biden, First Lady Dr. Jill Biden 'shocked' by Highland Park parade shooting
State Sen. Julie Morrison said she was about a block away from the shooting.
"We heard gunshots that I kind of thought it was fireworks, then all of a sudden this wave of people starts running back towards us screaming, crying, hysterical, carrying their kids," Morrison said.
WATCH: Suburban parade shooting witnesses describe fleeing from gunfire, hiding children
Suburban parade shooting witnesses describe fleeing from gunfire, hiding children
In the aftermath of the shooting, police patrolled the area with rifles.
'At what point do we say enough?' Highland Park mayor says
'At what point do we say enough?' Highland Park mayor says
A woman who was at the parade with her family said her best friend's sister was among those shot.
"People screaming and running, it was just really traumatizing and scary," she said.
Ariel Rotbol was walking in the parade with a state representative when she heard the gunshots.
"It was a war scene," Rotbol said. "People just in hysteria. We saw the helicopter, the cars, Homeland Security coming in. In Highland Park, we have not experienced this yet and I don't think anybody obviously thought this is what was going to happen today and it is just hard to fathom."