Search goes on for missing workers at Florence collapse site. One Romanian, two north Africans and an Italian, were killed in the disaster Friday morning.

Unions have called strikes to call for urgent government action to up safety on worksites amid the spate of fatal accidents in Italy. The accident happened after a retaining concrete beam collapsed, bringing the whole building down on the workers underneath.    Some sources have pointed to potentially shoddy buildingmaterials being used. ALL RIGHTS RESERVED © Copyright ANSA.