Shoppers in and around a supermarket in Buffalo, New York, describe hiding behind cars, calling out for help as a gunman killed 10 people and wounded three others in a mass shooting authorities believe was racially motivated.

Grady Lewis said he was outside the supermarket when he heard seven or eight gunshots, and described seeing a White man “fully prepared, ready to go,” dressed in tactical gear spraying gunfire at the entry of the store, which is located in the heart of the city’s Black community.

Law enforcement arrived within two minutes after the shooting began, Lewis told CNN affiliate WKBW. He “heard at least 20 or so shots” before the suspect exited the store.

“He came out, he put the gun to his head, to his chin. Then he dropped it and took off his bulletproof vest, then got on his hands and knees and put his hands behind his back,” Lewis said, describing the moments the suspect was arrested by police. “I thought they were going to shoot him but they didn’t shoot him.”

“I still don’t even believe it happened … that a person would go into a supermarket full of people,” he said. “It was horrible, it was really horrible.”

One woman told WKBW she received a distressing phone call from her “scared, hysterical” 19-year-old granddaughter who was at the supermarket and heard gunshots. The woman raced to the scene and found her granddaughter outside the store.

“I can’t even explain it, how grateful I am to God that she’s ok because she could have been one of the other people,” she told WKBW.

Read the full report here.