Two buildings on a busy street collapsed in the centre of the northern French city of Lille early on Saturday, with one person injured and another missing. The rescue operation involved specialized units and 40 emergency vehicles, the fire brigade said. After hours of searching, a lightly injured victim was pulled from from the rubble. Another man is still unaccounted for, the newspaper La Voix du Nord reported. The collapse occurred at about 9:15 am (0815 GMT) on a street heavily frequented by tourists shopping throughout the day, especially on weekends. Renovation work was in progress at one…