A 17-year-old Lake Elsinore boy was arrested Tuesday night after authorities say he sent messages via social media threatening to shoot up Lakeside High School and possibly commit suicide.

School officials reported the threats to the Riverside County Sheriff’s Department Tuesday evening.

The messages had been sent out a few days earlier but school officials did not find out about them immediately, sheriff’s officials said.

Deputies found the teen, who attends Lakeside, at his home. They met with his parents, who cooperated with the investigation, a sheriff’s news release said.

Lt. Dave Lelevier said deputies found no guns at the house and the teen told deputies that he had no access to a gun.

Lelevier said investigators were still working to gather digital evidence of the threats from the teen’s phone.

The teen, whose name was not disclosed, was booked into juvenile hall on suspicion of making criminal threats.

Though there were some extra patrols at the Lake Elsinore campus Wednesday, sheriff’s officials said the school is safe.

“He was acting in a lone capacity,” Lelevier said. “There was nobody else involved.”

Mark Dennis, a spokesman for the Lake Elsinore Unified School District, said parents of students at the school were notified of the threats by phone and email Wednesday morning.

He said school attendance at Lakeside appeared to be normal Wednesday.

Authorities ask that anyone with information call the sheriff’s Lake Elsinore Station at 951-245-3361.