The incident occurred in the V-Mall from the San Juan region of the capital.
San Juan Mayor Francis Zamora told colleagues that roughly 30 individuals are being held with the gunman. He said the specific number of hostages is unclear and is based upon the size of their workplace.
He said the gunman is a disgruntled former security guard who was removed from his job in the mall. Zamora said the gunman shot an individual, who’s in stable condition at a nearby hospital.
Over a dozen SWAT commandos were spotted entering the mall, assault rifles prepared. Policemen stood outside, together with an ambulance.