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Students at Academy of Holy Angels High School in Richfield were sent home for the day Tuesday morning after a bomb threat was phoned in, according to school officials.

Police and bomb-sniffing dogs searched the campus, and no suspicious items were located, said Police Lt. Brad Drayna. School officials said classes would resume Wednesday on a late-start schedule.

Callers reaching the Catholic high school at 6600 Nicollet Av. heard a recorded message about the abrupt cancellation of classes and directed students on how to reunite with their families. The recording offered no specifics about the nature of the emergency.

"School has been canceled for an unforeseen emergency," the 45-second recording began.

Early Tuesday afternoon, the school consulted with police and released further details.

"An unknown person called Academy of Holy Angels and left a voicemail implying an explosive device posed a threat to the school," the notice to parents read. "Out of an abundance of caution, AHA Administration and the Richfield Police Department evacuated the school building. ... By 9:30 a.m., explosive detection K-9 units from four local police agencies cleared the entire building and gave the all-clear message that a return to the school and campus was safe."

Classes normally begin at 7:50 a.m. each day, according to the school website. One Holy Angels family reported receiving the school cancellation notice at 8:17 a.m.

Holy Angels has an enrollment of more than 600 students in grades 9 through 12.

The statement added that a similar threat was made Tuesday morning to Academy of the Holy Angels school in Demarest, N.J.

"The Richfield Police Department is actively working in collaboration with New Jersey law enforcement to investigate the incident," the statement continued.