Two buildings on a busy street collapsed in the centre of the northern French city of Lille early on Saturday. An investigation and rescue operations are under way, according to the fire department. So far, no victims have been discovered. The collapse occurred at about 9:15 am (0815) on a street heavily frequented by tourists shopping throughout the day, especially on weekends. Renovation work was in progress at one of the two adjoining buildings, which are not far from the historic main square, according to the La Voix du Nord newspaper. Residents of one of the buildings had already been eva…