[Updated at 3:12 p.m.] The gunman in Thursday's Johns Hopkins shooting - identified as Warren Davis, 50 - shot himself and his mother, who was being treated at the hospital, Baltimore's police commissioner said.

Davis was standing outside room 873 in the Nelson building, where he was being briefed by a doctor about the condition of his mother, Commissioner Frederick H. Bealefeld said.

"Mr. Davis was receiving some news about the care and condition of his mother just outside the doorway to that room when he became emotionally distraught," the commissioner said.

During the conversation, Davis pulled a small, semiautomatic gun from his waistband and shot the doctor once in the lower chest/upper abdomen, he said.

Within minutes, a tactical team later entered the hospital and found Davis dead from a self-inflicted gunshot wound. His mother had also been killed, Bealefeld said.

[Updated 2:33 p.m.] Baltimore police now say the incident at Johns Hopkins Hospital is a murder-suicide.

The gunman, who shot a doctor in the abdomen, killed himself as well as someone else. It was unclear who else was killed, but sources say the wounded doctor is expected to recover.

Some media outlets, including The Baltimore Sun, are saying that the gunman shot his mother, who was being treated at the hospital.

[Updated 2:23 p.m.] There are now conflicting reports on how the shooter at Johns Hopkins Hospital died.

Some media outlets are reporting the gunmen shot himself, but CNN has not been able to confirm the reports. Police earlier told CNN that police shot the gunman.

[Updated 2:04 p.m.] Minutes after police announced the shooter at Johns Hopkins Hospital was killed by a tactical team, police spokesman Anthony Guglielmi said, "The situation is resolved."

SWAT team members leaving the scene told CNN the same.

The situation has now moved from a tactical operation to a crime scene, Guglielmi said.

[Updated at 1:56 p.m.] Employees at the scene of the hospital shooting tell CNN affiliate WBAL that the shooter was unhappy with how his mother was being treated and that the wounded doctor was shot during surgery.

A reporter for The Baltimore Sun told CNN earlier that he had heard similar information from his sources.

One employee, Cynell Robertson, told WBAL that the moments after the doctor was shot were frightening.

Police have said the shooter was killed by police, but no further information was immediately available.

[Updated at 1:51 p.m.] Police say the suspect in the Johns Hopkins Hospital shooting is dead. He was shot by police, authorities said.

[Updated at 1:40 p.m.] Baltimore police say the situation at Johns Hopkins Hospital is contained, but "we're still trying to gain control of the suspect."

Police spokesman Anthony Guglielmi described the suspect only as an African-American male in his 30s. He further said police have heard reports the shooter is in a room, barricaded with a family member.

Guglielmi refrained from providing information on the shooter's location because there are televisions throughout the hospital.

He said there was no risk to the general public or patients and that the FBI is on standby. He wouldn't discuss whether police were in contact with the shooter.

As for the injured doctor, Guglielmi said he suffered abdominal injuries.

"He's in surgery as we speak, but he is going to be OK," he said.

[Updated at 1:14 p.m.] Criminal profiler Pat Brown tells CNN she believes the incident at Johns Hopkins could end "better than most situations" because the shooter does not appear to be a mass murderer.

The shooter may even realize he's made a huge mistake, and he might be scared because he knows he's trapped, Brown said.

A hospital employee, who said she left the hospital shortly before noon, told CNN affiliate WBAL that her shift isn't over for several hours. She has not been told to go home and she has not been able to return to work, she said.

"I really am scared," she told the station.

[Updated at 1:03 p.m.] A statement from Johns Hopkins Hospital says the doctor who was shot is a "faculty physician" and that confidentiality policies prohibit the hospital from releasing more information.

[Updated at 12:42 p.m.] Police say they know where the Johns Hopkins suspect is and have him cornered.

However, said police spokesman Anthony Guglielmi, there is no information on whether the shooter has hostages.

Guglielmi said tactical units are on the scene, but the emergency room remains open and the incident is contained to one floor.

He further said he has learned that the doctor's condition has been upgraded, and his injuries now do not appear life-threatening.

Justin Fenton, a crime reporter for The Baltimore Sun who is across the street from the hospital, said a source tells him the shooter is upset about his mother, who is being treated at Johns Hopkins.

[Updated at 12:35 p.m.] Baltimore police say a SWAT team is on the scene as they attempt to apprehend the shooter.

[Updated at 12:29 p.m.] Baltimore police say earlier reports that a suspect was in custody in the shooting at Johns Hopkins Hospital were incorrect.

Baltimore Police Department spokesman Anthony Guglielmi said authorities also have no information on a motive or the relationship between the suspect and a doctor who was critically wounded.

[Updated at 12:25 p.m.] A shooter who critically injured a doctor at Johns Hopkins Hospital in east Baltimore, Maryland, has been "subdued and disarmed," according to a hospital spokesman.

Police reported that a doctor had been shot, and Johns Hopkins spokesman Gary Stephenson said the injured doctor had been taken to an operating room.

Earlier, local media said the suspect was hiding in a patient's room on the eighth floor of the hospital. CNN affiliate WMAR in Baltimore said the shooter had barricaded himself. It's unclear if the shooter was alone in the room.

Reports indicate the wounded doctor is in critical condition. Many people were evacuated, according to reports. Those who weren't evacuated were told via e-mail to stay in rooms at the hospital, which has about 1,000 beds. The e-mail further instructed them to keep room doors locked and to stay away from windows.

The hospital released a statement saying it had temporarily restricted access to the hospital's main buildings.

"Baltimore police and Johns Hopkins security officers are on the scene and have asked employees, visitors, patients and caregivers to stay in rooms or offices, with doors locked where possible, until further notice," the statement said.

Your invisible friend is useless. Quit wasting your time and do something useful. Prayer is just a nice way to make your guilt about doing nothing worthwhile for this world go away. "Well, I never actually helped anyone...but I prayed a lot!"

Why would you thank God that the shooter was subdued and not rail at God for allowing the shooting in the first place? You mean he can facilitate the subduing but NOT prevent the shooting? What a worthless god.

Come on guys. Why do you have to be so political with the anti religion and Tea Party comments, even before knowing the facts. No wonder there is so much hate and fighting in this world of ours. This person's post does no harm. Give it a rest.

My friend's mom spent a whole year going to the hospital because she wasn't feeling well. She would always be told she was fine and sent home. When they finally found her cancer, it was spread all over her body. You think something similar happened to this guy?

I am a physician locked in here right now while this is happening and a victim is fighting for their life because they came to work today, but you people think this is amusing. You people are real class acts.

I don't find anything funny about this shooting, or about racist remarks....no I am NOT black, I am a caucasian aunt who is desperate to know that her nephew is safe and who is praying for the victim and all who are in lockdown.

I hope everyone starts to take this seriously. Someone was shot and someone else felt desperate enough that he had to try and take the life of another person. This isn't TV where a hour later things are ok and back to normal. These 2 people and their families lives have been changed forever!

This hospital is a wonderful hospital and does a lot of good things! I hope everyone is ok and knows not everyone out here thinks this is a joke! For those who are in the hospital, be safe and stay calm! We are sending positive thoughts your way that you and your coworker make it through this senseless act!

I've been involved in shootings in the past, it's quite unfun.
Frankly, these fine examples of Chumpanzees would be soiling their pants in panic and doing everything possible to get themselves and others injured in their panic.
They even scoff at the possibility that someone in the hospital has internet, apparently they think that the internet gets shut down in hospitals and companies when something happens. Nope, only on military installations does that happen.
And frankly, the primary source of information in a locked down facility ends up being the internet.
Best wishes to those in the midst of this mess. At least the shooter is in custody. And my sincere hops for a full and uneventful recovery for the victim.

Hopkins doc, I am a hospital police administrator in NC. This is what we train for every day. I have been in this business for 14 years and hospital are slow and behind the curb when it comes to security and police for the most part. I pray all turn out for the best for all. I know it will only be WHEN it happens at this hospital with no metal detectors, low number of officers, and budgets that won't keep them safe. I am sorry for this tragedy.

Those comments come from people that no one could help. It only takes a couple of generations to breed these lonely people out. Their parents didn't love them. They don't love themselves. They won't love their kids. Their kids will not love....period. It will be up to their children to either break the cycle or complete it (by not having children due to emotional abandonment). Meanwhile, don't worry about them and continue caring about those who do matter.

Jalynne, it is also the obligation of those who do love others to include care for those who grew up in a barren emotional environment. After all, if all of society abandones these people, what would prompt them to break their cycle of not loving? Constant reinforcement of coldness does not lend itself to reform. The Golden Rule? Still the most unpracticed on this planet. How do you stand on that?

Though this comment is unneccessary I do want to say that this person who was shot at least has a fighting chance since he was so close to such a wonderful hospital! that is the one big blessing out of this! I am sure there are many more – like the fact only one person was injured here and all the patients within the hospital seem to be ok...says a lot about the hospital and the response they have set up!

@James and @erasableblip-you should've gotten shot instead! What ridiculously ignorant statements. What–you've never seen anyone who wasn't black and didn't live in Baltimore t
hat was shot or a crime victim? Wow-what morons!!! Oh and @James: penis envy is a terrible thing Dear.ðŸ˜¦

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