children gathered outside the school after 7 a.m., waiting for the day to begin.

At first confused about why schoolmates were running, he saw Landsberry lying wounded on the basketball court. A friend called 911. Mason and other students wanted to get Landsberry into the school, he said.

"We tried, and one of my vice principals ... said, 'Get in the building, get in the school fast.' And that's when I ran to my backpack, and I (eventually) got shot."

Reyes -- a friend Mason had met at the start of the school year -- said nothing as he shot him, Mason recalled.

When Mason was shot, he said, he felt a sharp pain in the abdomen and ran from the shooter. He soon saw a security guard, who told him toit, he would start arguing ... with that person about what the person said. I (saw) him doing it a lot at school," Mason said.

Mason said he doesn't believe Reyes sought him out or the other wounded student during the shooting.

"We never bullied him. We never (did) anything to" him, he said.

"After he shot me, I thought that he wasn't my real friend," he added.

Davis, Mason's mother, told CNN that she grieves for the shooter's family.

"They lost their son, their baby," Davis said. "They're 12-year-old boys ... they have no idea what they're doing."

Reyes took his parents' handgun to school, a federal law enforcement source said. Sparks Deputy Police Chief Tom Miller said Tuesday that authorities weren't positive where the gun came from, but believe it belonged to