Two days of threatening emails sent to teachers at Brookwood High School prompts more than 400 students to stay home Thursday.

Some classrooms were virtually empty during first period as students were afraid to go to the school.

The emails, which were sent to both teachers and staff on Tuesday and Wednesday, threatened to shoot up a school but did not name Brookwood specifically. They were reportedly sent from an IP address in Europe.

Several schools in the northeast have received similar emails over the past month and the FBI is investigating in some of those cases.  The federal agency, so far, is not investigating the threats at Brookwood but officers with Gwinnett County School Police are.

The situation has unnerved some parents like Tiffany Orr who picked up her sons early Wednesday when news of the first round of emails got out.  She kept them out of school on Thursday.

“I can’t believe that anybody sent their children after hearing that,” she tells WSB’s Sandra Parrish.  “All I could think of is getting a call and having to rush there and wait to find out if something happened to my child.”

Seven school resource officers were on campus Thursday and are expected to be back Friday as well.

Senior Dylan Kuny is not sure if he will be back Friday.

“My mom was in college around the time of Columbine, so she’s always been really shared about shootings and stuff,” he says.