WAREHAM — Brian Whitney, a 15 -year-old Wareham student, described the harrowing scene Monday morning at the high school where the building was evacuated because of a threat.

At about 11 a.m. in the school library, he was with 11 students and a teacher when police suddenly arrived and told them to go to the computer room and barricade the doors, he said.

They remained there for an hour. "I heard a lot of banging throughout the school," he said.

The students and the teacher were later told to walk single-file, each with a hand on the other's shoulder as they were guarded on all sides by SWAT Team members and police dogs, to a bus, Brian said.

Once safely on the bus, they were escorted by police to the Wareham YMCA, where he was met by his mother, Cassie Whitney.

"I was very scared. You don't think it will happen to you," he said. "You see this happening all around the world, but when it happens to you it's a lot scarier."

The Whitneys live a short distance from the Wareham High School — Middle School complex and Cassie Whitney was home doing yard work when she heard all the commotion.

"I started to panic. I knew something was bad," she said.

She drove to the middle school, but police would not let her go down the roadway that connects with the high school.

Not knowing what was happening bothered her greatly, she said. "I can't even talk about it, especially not knowing. You couldn't get any answers," she said.

"I was texting my son, and he wasn't texting me back," Cassie said.

She went to the YMCA and waited for him.

"To see him on that bus just brought tears to my eyes, that all these children were safe, " she said.