What we know about the Dallas hospital shooting

• Methodist Health System Police arrested Nestor Hernandez, 30, after the shooting. Hernandez is on parole for aggravated robbery and had an active ankle monitor, the department said.
• Authorities responded to the Methodist Dallas Medical Center at around 11am local time on Saturday, CNN reports.
• There are no ongoing threats to the hospital, CNN notes.
• It wasn’t clear what might have led to the violence and the victims have not been identified, NBC News reports.

What they're saying: Dallas Police Chief Eddie Garcia called the shooting a "tragedy" and "an abhorrent failure of our criminal justice system."

• "We @DallasPD are grateful for the support and care provided to our officers by @mhshospitals. Our thoughts are with staff and victims of today’s events," he wrote on Twitter.
• "We will do EVERYTHING to assist in this investigation. This is a tragedy, and an abhorrent failure of our criminal justice system."

• The health system's executive leaders said that they are "heartbroken at the loss of two of our beloved team members," CNN reports from a statement.
• "Our entire organization is grieving this unimaginable tragedy."
• "Our prayers are with our lost co-workers and their families, as well as our entire Methodist family. We appreciate the community’s support during this difficult time."