Long Beach police announced Thursday they have arrested the third student in two days on suspicion of making threats to harm others at school, this one at Tincher Preparatory School in East Long Beach.

The most recent arrest came at about noon on Thursday after a school public safety officer had detained a 14-year-old student at the K-8 school on Petaluma Avenue, just south of Atherton Street, police said in a statement Thursday night.

A staff member overheard students talking about the threat, and that individual reported the information to police, authorities said. The student, who is in the eighth grade, was arrested on suspicion of threatening school officials.

Police did not identify the student. Further details of the threat were not disclosed.

Campuses in Long Beach have been on high alert all week. On Wednesday, a student at Wilson High and a student at Millikan High were also arrested on suspicion of making threats in separate incidents.

Police also increased security at Poly High School on Wednesday after social media posts began popping up warning of a rumored shooting plot.

At Millikan, officers arrived around 11:15 a.m. Wednesday after students told school staff they’d overheard a 15-year-old classmate who “made a threat to harm others at the school,” police and school officials said.

A similar situation played out at Wilson High School around 2:30 p.m. Wednesday when a 16-year-old was overheard making threats to harm others, police said.

Police encouraged anyone who knows anything about these specific cases, or hears anyone making threats, to call (562) 570-7250. Anonymous tips can submitted through “LA Crime Stoppers” by calling 1-800-222-TIPS (8477), downloading the “P3 Tips” app to your smart phone (available at the Apple App store and Google Play), or visiting www.lacrimestoppers.org.