A 28-storey tower in Frankfort, Kentucky has been brought down in a controlled implosion.

The Capital Plaza Tower was demolished nearly 50 years after it was constructed, after inspectors deemed it unsafe.

The state-owned building had previously housed many state offices, but closed in 2016 after it was ruled unsafe.

More than 680kg of explosives were used in the demolition.

The Tower stands 103m tower opened in 1972, and was the 12th tallest building in Kentucky.

The remnants and debris left behind from the demolition will be repurposed as the foundation of a new government building.

The marble that was inside was earlier salvaged for the new building.

Gov Matt Bevin auctioned off the opportunity to trigger the blast in a "Blow Up Bureaucracy" campaign, with the winning bid coming in at $15,000.

The proceeds will benefit First Lady Glenna Bevin's #WeAreKY! Foundation, which looks to better the lives of vulnerable children and families.