CLINTON — Police arrested an 18-year-old Denham Springs man accused of posting threatening messages against Silliman Institute on his Twitter account, Police Chief Fred Dunn said Tuesday.

Dunn said Kyle Blackburn, of La. 16, was booked at the East Feliciana Parish Jail on one count of terrorizing Monday after his arrest by Livingston Parish sheriff’s deputies and State Police.

Blackburn’s bail was set at $125,000.

The police chief said he and other officers, wearing plain clothes, were stationed at the Clinton school until Blackburn was apprehended, but the school did not institute a lockdown of its classrooms.

Dunn said Blackburn was a student at Central Private School in Central and the Central Private headmaster notified Silliman’s principal of the alleged threats Sunday night.

Dunn said Blackburn got into an altercation during a Central Private-Silliman basketball game several weeks ago and subsequently was banned from going back to the Clinton campus.

The police chief said the Twitter postings included language indicating he planned to come back to Silliman and the school “had one day to get it straight.”

Dunn said he and officials of both schools considered the postings a credible threat.