BOSTON -- The trial continued Tuesday in the case of a former Marshfield High School student accused of plotting a Columbine-style attack at his school.

NewsCenter 5's Amalia Barreda reported that the defense went on the attack, trying to discredit the prosecution's witnesses.

Joseph Nee, 21, faces charges of conspiracy to commit murder, promotion of anarchy and threatening to use deadly weapons at school.

"I was scared. I didn't know exactly how to respond to something like that," said 19-year-old Timothy Courshene.

He testified that in April 2004, Nee invited him to a meeting to discuss plans to attack the school and kill people on a hit list.

"Joe began stating his plan to take out Marshfield High School, take out certain people on that list," Courshene said.

"What was Joe Nee's demeanor like?" a prosecutor asked.

"Excited," Courshene said.

"How could you tell he was excited?" the prosecutor asked.

"Wide-eyed," Courshene said.

Courshene testified that the mission would end in suicide and said that Nee issued a threat to guarantee secrecy.

"Anybody had said anything to anyone else outside the group, they would have their tongues cut off," Courshene said.

Defense attorney Fran Robinson attacked the teen's credibility.

"You didn't tell the grand jurors the truth?" Robinson said.

"No, I didn't," Courshene said.

"You lied to the grand jury?" Robinson said.

"I was mistaken, yes," Courshene said.

The prosecution began the day by calling Joseph Sullivan, 18, who was given immunity from prosecution. He was asked to relay specifics about Nee's plan.

"I am sorry. I really don't remember," Sullivan said.

"You don't remember who said what, do you?" defense attorney Tom Dreschsler said.

"Not really, no," Sullivan said.

"You are not clear about what was discussed with regards to this so-called plan that you talked about. You are not clear about anything, are you?" Dreschsler said.

Sullivan testified that Nee told him he could get guns for the attack from his father, Tommy Nee, who is president of the Boston Police Patrolmen's Association.