A medieval tower in the heart of Italy's capital has partially collapsed during renovations of the structure, critically injuring one worker and trapping another.

Hundreds of tourists watched as firefighters used a mobile ladder to bring a stretcher to the upper level of the Torre dei Conti to rescue the worker who remained trapped.

The building is close to some of Rome's most famous landmarks, including the Roman Forum ruins and the Colosseum.

During the rescue attempt, another part of the structure partially collapsed, sending up a cloud of debris and forcing firefighters to quickly retreat.

Firefighter spokesperson Luca Cari said one worker remained trapped hours after the initial collapse.

He added that a rescued worker was being treated in critical condition and that another thre

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