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Remains of Italy bridge that collapsed, killing 43, demolished in planned blast

Click to play video: 'Controlled explosions demolish two pylons of Genoa bridge'
Controlled explosions demolish two pylons of Genoa bridge
Demolition crews used controlled explosions on June 28 to erase a tragic Italian landmark, bringing down the hulking remains of a motorway viaduct which had partly collapsed in the northern city of Genoa last year, killing 43 people – Jun 28, 2019

GENOA, Italy (AP) — A spectacular planned explosion on Friday knocked down the remaining spans and supporting pillars of the Italian bridge that collapsed last year with the loss of 43 lives.

The blast in Genoa at 9:37 a.m. triggered a huge cloud of grayish dust as the pillars and roadbed leaned inward, then crumbled like a sandcastle.

In a few seconds, the Morandi Bridge was history, with debris falling into the riverbed under what had been a key link between the high-speed highway leading to the French Riviera and another highway linking Genoa, a major port city, to Milan.

Minutes before the blast, sirens sounded a final warning. Some 3,500 people who live nearby had been evacuated as a precaution on Thursday and before dawn Friday. Before leaving, many had covered windows and doors with plastic sheeting in a bid to prevent dust from infiltrating their homes.

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WATCH: (August 2018) Italy police release security camera footage of fatal bridge collapse

Click to play video: 'Italy police release security camera footage of fatal bridge collapse'
Italy police release security camera footage of fatal bridge collapse

Other homes, directly beneath one of the bridge’s spans, had been evacuated immediately after the Aug. 14, 2018, collapse. Those apartment buildings will be eliminated as part of the replacement bridge’s construction.

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Ahead of the planned blast, fire hoses sprayed water to reduce dust triggered by the blast. Still, the cloud of dust and debris seemed to darken the sunny sky. Frightened dogs barked at the noise.

Prosecutors are considering possible design flaws or poor maintenance as they search for the cause of the deadly collapse during heavy vacation holiday traffic.

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World-famed architect Renzo Piano, a Genoa native, has designed a replacement bridge, that will feature 43 lamps dotting the span in tribute to those who lost their lives when a stretch of roadbed gave way, plunging into the dry riverbed below, during a fierce thunderstorm. Traffic on the bridge was very heavy that day, the eve of Italy’s chief summer holiday, Ferragosto.

Genoa Mayor Mario Bucci said engineers will check to see if the nearby apartment buildings are still sound after Friday’s explosion. If they give the all-clear, residents will be allowed to return to their homes.

WATCH: 2nd angle of Genoa bridge demolition

Click to play video: 'Drone footage captures destruction of Genoa bridge pylons'
Drone footage captures destruction of Genoa bridge pylons

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