Police radio dispatches from the Allen, Texas, mall shooting Saturday captured the chaotic moments as the massacre unfolded, including an officer who apparently confronted the killer, calling for backup before reporting, "I got him down."

"We got shots fired at the Allen Mall," an officer is heard saying in the radio dispatches, according to the Broadcastify, which records emergency transmissions.

A police officer was at the Allen Premium Outlets when the shooting erupted around 3:30 p.m. Saturday, raced to the gunfire and fatally shot the suspect, Allen Police Chief Brian Harvey said at a news conference on Saturday.

"We got people running," the officer on the scene radioed to a police dispatcher. "I need everybody I got."

A short time later, the officer radioed, "I got him down," referring to the gunman, who police have yet to identify.

A woman was shopping when she says the shooting began and described how people began to flee for safety.

Elaine Penicaro said in an interview that she was finishing up her shopping when she heard "popping" noises and began to realize how dire the situation was.

"We saw sparks flying like it was right in front of us. So we just ran into the Converse store. They locked the door. We all hunkered down in the back. And that's where we stayed," she said.

Penicaro said she heard the police arrive within five to 10 minutes.

A vigil will be held Sunday afternoon in the aftermath of the deadly shooting.

State Rep. Jeff Leach said that a vigil was planned for 5 p.m. at Cottonwood Creek Baptist Church. He made the announcement during a briefing Saturday evening.

"This community is home for us and our hearts are devastated and broken tonight no law enforcement official no elected official Ever imagines or plans to or hopes to speak in front of a press conference like this," Leach said.

Ken Fulk, the mayor of Allen, called the shooting a tragic day for the community and extended his sympathies. Fulk, who was elected in 2020, also pledged his support.

"Today is a tragic day for the city of Allen, our citizens, our friends and visitors who were at the Allen Premium Outlets today. We are a strong and caring community and we all want the victims and their families impacted by this tragedy to know that we will wrap our arms around you. And we are here for you," he said.

Vice President Kamala Harris released a statement Sunday about the shooting, also urging Congress to act.

"Doug and I mourn for the eight adults and children who lost their lives, pray for those wounded, and send our gratitude to the first responders who ran toward danger," she said in a statement.

"All Americans deserve to be safe from gun violence. But they are not," Harris continued. "Not because we do not know the solutions. Not because the American people are divided on this issue -- even a majority of gun owners support sensible reforms."

Harris urged Congress to send a bill to President Joe Biden that would ban assault weapons and high-capacity magazines, and would introduce universal background checks.

"We need action," Harris added.

-ABC News' Molly Nagle