Jesus Christo, 18, told The Huffington Post that he and Martin were stopped by an officer who said they fit the descriptions of recent robbery suspects. Christo declined to speak over the phone, but spoke through direct messages on Twitter.
The officer attempted to search Martin, who refused, Christo said.
"The officer then stepped back and drew his weapon and pointed at Antonio and told us to lay on the ground," Christo said. "I layed [sic] down but Antonio Refused [sic]."
More from Christo:
"The officer then began to step back from us with his gun still aimed at us. He told Antonio to lay down once again and when Antonio didn't lay down the officer opened fire. And when I tried to get up to help my friend he screamed at me to stay down with his weapon still drawn."