A worker trapped for hours under rubble in Rome following the partial collapse of a medieval tower near the Colosseum has died, local media said.

The man was rescued by emergency services late yesterday and taken to hospital in a serious condition, Rome police chief Lamberto Giannini had said.

Parts of the 29m Torre dei Conti crashed to the ground on at least two occasions, videos showed.

The first collapse took place at around 11.30am local time (10.30am Irish time), the second about 90 minutes later.

Clouds of dust came billowing out of the windows, along with the sound of collapsing masonry. The second incident took place while firefighters were working on the structure with aerial ladders.

A second worker was pulled out almost immediately and brought to hospital with serious but not life-threatening head injuries, while two more workers suffered minor injuries and declined hospital treatment.

None of the firefighters were injured.

Authorities have seized the construction site, Italian daily Corriere della Sera reported.