SACRAMENTO (CBS13) – Police investigated a bomb threat made against a school district in Sacramento this morning.

The threat was made towards Robla Elementary School District. Sacramento police officers are working closely with district administration to provide precautionary measures, according to a police statement.

The school district is north of Interstate 80 near Marysville Boulevard and Rio Linda Boulevard.

A threatening email was also sent to the Calaveras County Sheriff’s office, which officials say is likely a hoax.

Mark Twain School District staff also received a threatening email Thursday night. According to the Calaveras County Sheriff’s Office, the FBI was aware of the email and says it’s likely a hoax from the same group that sent similar emails on Monday.