Ryan Borowski, one of the people inside the King Soopers grocery store when a shooter starting firing shots, said everyone helped each other get out of the back of the store.
He said he heard two loud sounds, and by the third one, he and the people around him realized they were gunshots. He said they started running to the back of the store and employees helped them out the back door.
"We told employees what was going on so everybody helped each other and we just ran to safety as quickly as we could," Borowski told CNN from behind the store in Boulder, Colorado, about two hours after the shooting.
Borowski said he was going to get ice cream, but then changed his mind and started walking the other way.
"I didn't see the shooter. I saw terrified faces running towards me and that's when I turned and ran the other��direction," he said.
He said everyone was helping each other, but while some people ran, others froze.
"We ran and I don't know why other people didn't and I am sorry that they froze and I just wish that this didn't happen – I wish I had an answer for why it did," he said.
He said he could have never imagined a situation like this happening in Boulder.
"Boulder feels like a bubble and the bubble burst and that's heartbreaking. To think that people died today," Borowski said. Police have not confirmed whether anyone was killed.
"This feels like the safest spot in America and I just nearly got killed for getting a soda, you know, and a bag of chips. Doesn't feel good," he added.