LONG BEACH, Calif. (AP) — Police say two students were arrested on suspicion of making unrelated threats at two Southern California high schools just miles (kilometers) apart.

The arrests in Long Beach Wednesday came as Los Angeles County sheriff's officials announced the arrest of a 17-year-old student suspected of threatening to open fire at his school in nearby Whittier. Deputies seized two assault rifles.

The Press-Telegram says Long Beach police didn't provide specifics about the threats against Millikan High and Wilson High. Stepped up patrols are planned Thursday for schools across the city south of Los Angeles.

A national organization that tracks school threats says it's recorded about 50 a day on average since last week's deadly mass shooting in Florida, compared with about 10 a day on average.