Friday started off as a normal day, according to one emergency room doctor.

"It was 1 o'clock in the morning, and we already had an ER that was full of patients," the doctor told 9NEWS. "We got a phone call that basically said there was a shooting in the area, and we needed to be ready for multiple people with gunshot wounds coming into our department."

Patients started pouring into hospitals around the city after 24-year-old James Holmes shot into a crowded movie theater - killing 12 people and injuring 59 more.

"Our patients came in by police, by ambulance, by private vehicle, and we would meet them by the door and triage them," the doctor said. "Time moved very slowly last night but all of our patients came within 1 to 2 hours of each other. And so it was what I would call coordinated chaos."

Dr. Upshaw with Children's Hospital also spoke to 9NEWS about the shocking morning they had.

"It's a very sad day for the community," Dr. Upshaw said. "Our thoughts and condolences go out to the victims and their friends and families. We had six patients at Children's and one, unfortunately, passed."

But the doctors are prepared to help people who are in need.

"This is what we train for, and you get used to having to handle crazy situations," the doctor said. "But I think all of us are going to have to take some time to sit back and process what we saw tonight because some of those scenes were absolutely tragic."

Dr. Upshaw completely agreed.

"We train for this kind of trauma and mass casualty," Dr. Upshaw said. "We train for the patients that are brought to us. If need be, and have adult patients that need long-term care, we can contact other hospitals. For a trauma like this, we are well-trained and well-equipped to stabilize patients that we can stabilize."