NIWOT, Colo. — Niwot High School was evacuated Tuesday morning after two bomb threats were received, the Boulder County Sheriff’s Office said.

The sheriff’s office said the first threat was received through Safe2Tell on Monday night.

The sheriff’s office and the St. Vrain Valley School District began to investigate and interviewed to students with assistance from the Mead police Department.

Officials did not believe the threat to be credible based on the initial investigation, but there was additional law enforcement when the school opened Tuesday morning.

A second Safe2Tell concerning the bomb threat provided more context to the first report, the sheriff’s office said.

A decision was made just after 11 a.m. to evacuate the school at 8989 Niwot Road out of an abundance of caution.

Roads were closed in the area as students were reunified with parents at a nearby church.

No injuries were reported.

The sheriff’s office said after a thorough search of the campus by law enforcement, including K-9 teams, nothing suspicious was found.

The threats remain under investigation by the sheriff’s office.