A 15-year-old boy who had reportedly been picked on and had talked about shooting classmates allegedly opened fire Monday at Santana High School, killing two people and wounding 13 in the nation's deadliest school attack since Columbine.

San Diego County District Attorney Paul Pfingst identified the shooter as Charles Andrew Williams (pictured, left) and said that he would be charged as an adult with murder, assault with a deadly weapon and gun possession.

Arraignment was set for Wednesday.

According to sheriff's officials, Williams surrendered in the bathroom, dropped his gun and said that he acted alone, telling officers: "It's just me."

"When our detectives recovered the weapon, the weapon was fully loaded with eight rounds and the hammer was cocked," Sheriffs Lt. Jerry Lewis said.

The dead students were identified as Bryan Zuckor, 14, and Randy Gordon, 17.

According to 10News, 13 victims -- which included 10 students, a school security guard and a 29-year-old student teacher -- were taken to local hospitals.

As of Tuesday morning, nine of the victims had been released and the remaining four were expected to fully recover.

Suspect Aims, Smiles, Fires

One student said that Williams had a smile on his face as he fired from a boys' restroom into the school's crowded hallways at 9:20 a.m.

Hundreds of students who were moving from first to second period were potential targets.

"We saw the whole thing happen. ... I was in the room right across from where the boys' bathroom was. When we heard the shots, I thought it was fake, but my teacher said that it was real," Santana student John Sharp told 10News.

"I didn't see where the shots were coming at first, and then you looked over and you see the kid smiling and shooting his weapon.

"When he came back out of the bathroom, he was smiling. He was looking around and smiling. With his weapon, he fired two more shots and went back in.

"At the time, the student stayed in the restroom until the police came. They had their guns drawn; it was quite a scene," Sharp said.

Student Alicia Zimmer told 10News that she saw a boy lying face down on the floor, a girl with blood on her arm and another with blood on her hands.

Zimmer said that she heard shots but didn't see a shooter.

"They sounded more like a cap gun," she said of the noise.

After the shooting, students were escorted to a nearby shopping center, where they filled a parking lot and milled anxiously while parents arrived and paramedics took away the wounded.

"I know in your minds is the overriding question: 'Why?'" District Attorney Paul Pfingst said. "The suspect has made statements. I will not share the contents of the statements with you at this time, but there is no real answer. I am not sure in any real way we will ever know why."

Was The Shooting Planned?

Fellow students and an adult acquaintance said they had heard Williams' threats over the weekend but thought he was joking and did not report him to authorities.

Over the weekend, Williams "was joking on and off that he was going to come to school and shoot people," said Joshua Stevens, 15, a friend of the boy.

"He had it all planned out, but at the end of the weekend he said he was just joking and he wasn't really going to do it.

"I said, 'Like, you better be.' And he said, 'No, I'm serious.'"

"I should've stepped up even if it wasn't true and stuff to take that precaution," said Chris Reynolds, a 29-year-old who is dating Stevens' mother.

"That's going to be haunting me for a long time; that's going to be with me for a long time. It just hurts, because I could've maybe done something about it."

Reynolds said that Williams lives with his father, who reportedly owns two .22-caliber handguns and two shotguns.

Classmates and acquaintances described Williams as skinny and the subject of constant harassment.

"He was picked on all the time," student Jessica Moore said. "He was picked on because he was one of the scrawniest guys. People called him freak, dork, nerd, stuff like that."

Officials React To Shooting

In Washington, President Bush called the shooting "a disgraceful act of cowardice."

"This is my worst nightmare," Principal Karen Degiescher said.

She said that the campus will be closed Tuesday and that counselors were called in to help students.

Santana High School is about 10 miles northeast of San Diego and is the alma mater of Sharon Davis, wife of Gov. Gray Davis. She spoke during the school's commencement in 1999.

"Sharon and I are shocked and deeply saddened by this tragedy," the governor said in a statement. "Our hearts and prayers go out to the students and their families, the school administrators and the law enforcement officials involved in this incident."

Santee's new mayor also weighed in on the situation.

"I've been mayor of Santee for nine weeks, and if I was mayor for 900 years, it would not have prepared me for this moment," Randy Voepel said. "This could happen in any town in America if it could happen in Santee."

10News held a community forum Monday night where hundreds of local residents expressed sympathy and shared their concerns.

In addition, about 1,000 people gathered at Sonrise Community Church in Santee for a memorial service. The names of the two students killed and those who were wounded by the gunfire flashed on a video screen above an altar.

A number of different pastors from San Diego-area churches helped mourners cope with their grief.

"It's amazing how much damage can be done in a few minutes, but it will take years of healing to deal with the shooting," Santee Mayor Randy Voepel said.

The Santana High School sign had become a makeshift shrine by Monday night, surrounded by flowers, balloons and candles. A lone balloon rose amid one bouquet with the words, "I'm sorry."

Counseling for students and parents will be available beginning at 8 a.m. Tuesday at Sonrise Church, which is located at 8805 Magnolia Ave.

Community Reaches Out

Students and parents affected by the Santana school shooting can seek counseling at:

Sonrise Community Church
8805 Magnolia Ave.
8:00 a.m. - Evening
(619) 596-7667

Santee Teen Center
9470 Cuyamaca St.
9:00 a.m. - Evening