Today in Plaza Azteca, there is an active shooter. What exactly happened?

There have been reports of a shooting at PlazaAzteca, and some people have been taken to the hospital.
I’m at PlazaAzteca, just off Veterans Blvd., where police have been dispatched to a gunshot. The entire parking area is cordoned off, and visitors and personnel have been evacuated.
At this moment, no injuries have been confirmed.