Berkeley Police responded to the threat, which was scrawled in a boys' bathroom.
Soaked by the rain, hundreds of students at Berkeley High and elsewhere walked out of class and mourned for the young victims of mass shootings.
Berkeley police are investigating whether the threat is credible, and will be stationed around the campus through the evening, said BHS Principal Erin Schweng in an email.
A small volunteer group is building a radio communications network so Berkleley neighborhoods can communicate during emergencies when the power grid and internet are down.
The arrests happened at the end of Red and Gold day, the culmination of Unity Week, which used to be known as Spirit Week.
In recent months, the city and campus community have worked together to improve fire safety in large group homes, in particular, before special events or parties.
Take part in a five-minute earthquake drill wherever you are Oct. 19 and start the process of preparing for a disaster.
Police are looking for a group of three men after an 18-year-old UC Berkeley student was punched unconscious at a Cal dorm early Sunday morning.
Students say they are reeling from the revelation and want consequences for the creators of the memes.
BPD: "At this point it doesn’t meet the criteria to be attempted kidnapping."
Don your critical thinking caps and check your assumptions at the door: A new BHS class offers a deep dive into the justice system. And diverse views are welcome.
While policies elsewhere limit the rights of transgender and non-binary students, BUSD tries to be as accommodating to its gender non-conforming students as possible.
Disability rights attorneys have sued BUSD, contending that the district fails to accommodate students with reading disorders.