"There could have been about 200 people (in the warehouse)," La Vanguardia quoted the mayor as saying, adding the number of people who stayed there fluctuated from day to day.
The Spanish government intends to vaccinate between 15 and 20 million people against the coronavarius by May or June next year, Prime Minister Pedro Sanchez said on Friday.
The 82-year-old revealed on Monday that he had taken the decision to leave Spain to help his son, the current King Felipe VI, "exercise his responsibilities".
Spain has been one of the worst affected countries, suffering more than 28,000 deaths, with its economy and especially the key tourist industry devastated.
The 31-year-old, who plays for Atletico Madrid in La Liga, pleaded guilty in Madrid court on Thursday to evading €1.1 million in taxes on his image rights.