He declined to comment on a motive for the threats or any connection White may have to the school system.

Multiple members of the police force praised school authorities for following established safety procedures.

“They are to be commended for their excellent work,” Chief Parks Snead said.

Superintendent Scott Brabrand said he will hold a debriefing with principals to discuss their crisis plans to determine where the contingencies succeeded or could be improved. But he expressed pride in school leaders.

“I think we did an outstanding job,” he said.

Zuidema said investigators used “sophisticated investigative techniques” to track down White and commended the department’s Digital Evidence Recovery Unit. He declined to discuss the exact methods used to connect the accused to the threats.

“Easily a dozen” detectives helped investigate the case, and other officers responded to schools when bombs were reported, Zuidema said.

Threats hinder the department’s ability to respond to callers who are in real danger and truly need police assistance, Zuidema said.

“We are not going to tolerate this type of activity in the city,” he said.