A 15-year-old boy in Utah was arrested Tuesday in connection to calling in fake threats of a bomb and a shooter at a high school this week, investigators said.

Officers responded to Cedar High School on Monday after receiving a report of a potential bomb threat, the Cedar City Police Department said. After the school was evacuated and placed on lockdown, investigators determined the threat was a hoax.

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On Tuesday, a second phone call was made about a man clad in all black and wielding a gun on campus, police said. The school was again put on lockdown, and officers searched the campus for any threats.

Following the search and a review of the school's surveillance video, police said the threat was another hoax.

Cedar High School in Utah was locked down twice this week over separate threats of a potential bomb and a shooter on campus, both of which investigators determined were hoaxes. (Google Earth)

Hours after the second call, investigators determined the hoax calls came from a stolen cell phone. Police said video evidence and information from the cell phone provider pointed to a single suspect: a 15-year-old boy.

The teen was arrested and charged with second-degree felony abuse of 911 for the bomb threat, third-degree felony abuse of 911 for the threat of a man with a gun, and misdemeanor theft. He was taken to a youth correction facility.

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Police said that while there were no valid threats or public safety risks at the school, additional officers would be on campus for added security when classes resumed Wednesday.