A bomb threat this morning against Logan Park High School has been traced to a Dunedin property.

Armed police descended on the school earlier today.

Deputy principal Peter Hills said police traced the prank call made this morning to a Dunedin landline.

No pupils were at the school, but contractors were working on the new music block.

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Police cordoned off the Logan Park area with blockades at Harbour Terrace, Butts Rd and Dundas St. This was lifted early this afternoon.

Police were working with school staff.