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BOULDER, Colo. (KDVR) — Police responded to an unconfirmed report of an active shooter at Boulder High School Wednesday morning.

In a news conference at 11:20 a.m. Wednesday, Boulder Police Chief Maris Herold said the CU non-emergency dispatch received a call at 8:33 a.m. from someone saying they were in front of Boulder High with semi-automatic weapons and prepared to go into the building. Herold said the call sounded very authentic with the sound of actual gunfire in the background.

Herold said the caller sounded to be a male but could not confirm. The call is being analyzed by the FBI and other agencies, Herold said. The chief said the call seemed to be a “systematic way of calling schools,” but said further investigation of the call needs to be completed.

Boulder High School was put on lockdown after the report of an active shooter was received. BPD said the report was unconfirmed when the lockdown was issued.

A shelter-in-place was sent out to those living in the red area. This area included parts of the University of Colorado Boulder. At around 10:40 a.m., CU said the shelter-in-place had been lifted for the areas that impacted campus.

The shelter-in-place was fully lifted at around 11 a.m.

Shelter-in-place area for reports of active shooter at Boulder High. (Boulder Police Department)

BPD said there were no injuries and no threats were found in the school. Herold said a K-9 unit was brought in due to the reports of possible bombs in the school as well.

Buses were sent to the high school to evacuate students and send them to the reunification center. Students could be picked up at Macky Auditorium, located at 1595 Pleasant St., on CU’s campus starting at around 11 a.m. After-school activities have been canceled for the remainder of the day.

According to BVSD, school usually starts at 9:35 a.m. on Wednesdays. With the delayed start time, Herold said there were fewer students on campus when the threat came in but about 200 students were affected.

Police asked everyone to avoid the area.

Multiple Colorado schools received threatening calls and were placed on lockdown Thursday. FOX31 received a response from FBI Denver about the multiple calls.

FBI Denver is aware of numerous threats made today to a variety of organizations and institutions across Colorado. The FBI works closely with its law enforcement partners by providing resources and guidance in these investigations and can recommend cases for federal prosecution. While we have no information at this time to indicate a specific and credible threat, we continue to work with our local, state, and federal law enforcement partners to gather, share, and act upon threat information as it comes to our attention.

It is important to note that law enforcement will use all available resources to investigate a threat until we determine whether it is real or not. Investigating hoax threats drains law enforcement resources and diverts officers from responding to an actual crisis. More information about the consequences of posting hoax threats can be found on fbi.gov. We urge the public to remain vigilant, and report any and all suspicious activity and/or individuals to law enforcement immediately.

This is a developing story, FOX31 has a crew on the way to learn more.