All-clear given at Hollywood Hills High School after investigation led to lockdown, authorities say

The all-clear has been given and students were dismissed at Hollywood Hills High School after the facility was on lockdown for hours Tuesday morning while police investigated a threat, according to authorities.

According to Hollywood police, the school was placed on lockdown "out of an abundance of caution."

We ask the public to avoid the area and allow officers to safely carry out their duties," police said in a Facebook post.

That investigation left parents feeling uneasy, with some saying they had no idea what was happening inside the building.

"It's just terrible. Do you see that? Many, many police. It's coming more. I don't know what's happening inside. I have my two daughters inside. I don't know what happened. We don't have more news. We have nothing. We don't have information. Just to look at our emails," one emotional parent said to CBS News Miami.

After police thoroughly investigated, the all-clear was given and students were dismissed.

"The Hollywood Police Department has completed it safety assessment of the Hollywood Hills High School," police said. "The campus has been rendered safe, and there are no credible threats at this time."

Police tried to alleviate the fears of anxious parents.

"Everyone is safe," an officer shouted to a crowd of parents.

The threat was received around 9 a.m., according to authorities. While police initially suspected the report was not credible, they proceeded with a room-by-room search of the facility.

"Our school police department K-9 came to actually do some searches, and they actually had an alert that prompted secondary next steps, which would call for an evacuation," said Broward Schools Superintendent Howard Hepburn.

Students were evacuated to the school's athletic field while police conducted a secondary sweep. The threat was ultimately deemed not credible.

"It was so scary, we didn't know what was going on," said student Olivia Paneilinan.

For parents, the wait was agonizing.

"You know this is terrible," said David Zuniga, whose two daughters were inside the school. "Many, many police are coming. I don't know what happened inside. I have my two daughters inside. I don't know what happened."

Students were released at approximately 1:45 p.m., nearly five hours after the incident began. As they reunited with their families, many recounted the stress of the lockdown.

"We had to go in the corner we're supposed to go to when things like this happen," said student Iara Maldonado. "We had to stay down and stay quiet."

Police continue to search for the individual who called in the threat.