The man was arrested with a concealed knife in his possession. A Cotati man who threatened online to bring a knife to his son’s school — prompting an evacuation Monday — was arrested hours later with a concealed blade in his possession, authorities said.

The Sonoma County Office of Education (SCOE) said a threat posted on social media by a student’s father caused two schools to go into lockdown Monday morning. SCOE said the online threat is being handled by the Sheriff’s Office in an ongoing criminal investigation.

OCCIDENTAL, Calif. - A student's father made a threat on social media, which led to the lockdown of two schools in Sonoma County on Monday, officials say. Now the father has been arrested.