(Davis, CA) — Davis police are investigating yet another bomb threat. District offices and four schools in the Davis Joint Unified School District were targeted on Monday morning, delaying the start of classes by about an hour.

The Mary L. Stephens branch of the Yolo County Library system was also mentioned in the threat.

It was at least the fifth bomb threat targeting the library in recent weeks. Police say the threat, which was delivered via email, contained anti-LGBTQ-plus rhetoric.