A father of a student who threatened a school in western Sonoma County Monday morning has been arrested after his actions led to the lockdown and evacuation of two campuses earlier in the day, authorities confirmed.

According to the Sonoma County Office of Education, Harmony Elementary and Salmon Creek School were placed into lockdown around 9:30 a.m. The schools, which serve about 220 students from kindergarten through eighth grade, are located on the same campus in the town of Occidental.  

Sheriff's deputies said the lockdown was prompted after determining that a threat, which was made by the father of a student, was credible.

"This morning about nine o'clock, we received information that there was a threat to one of the schools," said Sgt. Juan Valencia, the public information officer for the Sonoma County Sheriff's Office. He confirmed the threat was directed at Harmony Elementary, but all three school campuses were evacuated as a precaution.

Valencia said the threat said "he [the father] was going to show up after school with a weapon and to make sure that the sheriff's deputies were there." 

Sheriff's detectives are currently searching for the man in question, he said.

Officials said Monday that students had returned to their families by 1 p.m. Classes are expected to resume at both schools on Tuesday.

Monday afternoon, the Sonoma County Sheriff confirmed on Facebook that the suspect was arrested. 

"At 3:31 p.m., detectives found the suspect in the 200 block of W. Railroad Avenue, Penngrove. Detectives and deputies took the suspect into custody," the post said. The suspect has not yet been identified and authorities have not specified what criminal charges he will face.