El Paso, Texas (CNN)When gunshots rang out at an El Paso Walmart, Gilbert Serna yelled for everyone to follow him.
He said he led nearly 100 people out the back of the store to safety before returning to the parking lot to help others.
"I was scared, I'm not going to lie, but I wasn't thinking about my own safety. I was thinking about everybody else's safety," Serna told CNN on Monday.
The father of two has worked at this Walmart store for almost 19 years. He was standing near the back of the store on Saturday when he heard a "code brown" announced over the two-way radio. It took him a moment to register what that meant — active shooter.
Seconds later, he heard gunshots.
The 36-year-old immediately signaled for customers and co-workers to follow him to the back room of the store. Through that room, Serna located the fire exit and led the large group out of the building.
"We were out in the open." Serna said. "I opened the shipping containers and told everyone to get in."
Walmart confirmed Serna is an employee and a spokesman said they were aware of his heroic act.
Instead of joining them safely inside the containers, Serna closed the door and went to check on more people who needed to escape.
That is when it hit Serna — this is not a not a domestic dispute, it was a mass shooting.
He walked along the side of the building and immediately noticed others standing out in the parking lot, including 6 or so members of a girls' soccer team who were fundraising in front of the Walmart.
Serna led them into Sam's Club next door and told them to wait for police.
While Serna was leading people to safety at the back of the store, another person stepped in to help others. Serna didn't know it at the time, but a regular customer he recognizes was helping people elsewhere in the store.
After hearing three gunshots and seeing at least five people bleeding on the floor, Adria Gonzalez pulled her mother by her blouse and made it to a storage area at the Walmart.
Gonzalez and her mother were shopping for their groceries and for a few school supplies they were planning to donate this week. They were walking by the meat counter when the shooting began, she said.
The assistant teacher took off her pink hat and started waving it at people nearby, signaling a way out for those in the store, Gonzalez told CNN on Saturday.
"Let's go, let's go. Vamos, vamos," the 37-year-old said. "Let's go."
About 40 people followed her to the storage area near the meat counter, where they waited in silence. They waited until they could no longer hear any gunshots.
Minutes later, the gunshots stopped. The group ran as they exited the building.
Walmart employees were there trying to help people escape and picking people up in their cars, Gonzalez said.
"You see this happening in the movies, but when you live it yourself, when you see a person killing, the blood everywhere," Gonzalez said. "You are in shock."