*A man shot and wounded a doctor Thursday at Johns Hopkins Hospital in Baltimore, then killed himself and his mother in a two-hour standoff inside the world famous complex, police said.

The gunman, 50-year-old Paul Warren Pardus, had been listening to the surgeon around midday when he “became emotionally distraught and reacted … and was overwhelmed by the news of his mother’s condition,” Police Commissioner Frederick H. Bealefeld III said.

Pardus pulled a semiautomatic gun from his waistband and shot the doctor once, the commissioner said. The doctor, identified by colleagues as orthopedic surgeon David B. Cohen, collapsed outside the eighth-floor room where Pardus’ mother, Jean Davis, was being treated.

Pardus then holed up in the room in a more than two-hour standoff that led authorities to lock down a small section of the Nelson Building while allowing the rest of the sprawling red-brick medical complex — a cluster of hospital, research and education buildings — to remain open.

When officers made their way to the room, they found Pardus and his mother shot to death, he on the floor, she in her bed.

The doctor was shot in the stomach but was expected to survive, Guglielmi said.

“The doctor will be OK. He’s in the best place in the world – at Johns Hopkins Hospital,”  Guglielmi said.

Police take position at Johns Hopkins hospital. Photo by Balitmore Sun reporter Justin Fenton.

Michelle Burrell, who works in a coffee shop in the hospital lobby, said she was told by employees who were on the floor where the doctor was shot that the gunman was angry with the doctor’s treatment of his mother.

“Basically, he was upset about his mother being paralyzed by the doctor,” Burrell said. “It’s crazy.”

A small area of the hospital had been locked down before the gunman died, as about a dozen officers wearing vests and helmets and carrying assault weapons prepared to go into the hospital at midday. Guglielmi said Pardus had not taken any hostages, and people with appointments in other parts of the hospital were encouraged to keep them.

The FBI was assisting Baltimore police, said FBI spokesman Richard J. Wolf.

Hopkins spokesman Gary Stephenson said Pardus was on the eighth floor of the Nelson building, the main hospital tower. According to the Hopkins website, the eighth floor is home to orthopedic, spine, trauma and thoracic services.

Guglielmi said the situation was contained to that part of the hospital, and no people had been locked in rooms or otherwise in danger.

The rest of the massive hospital, research and medical education complex remained open, including the emergency department.

With more than 30,000 employees, Johns Hopkins Medicine is among Maryland’s largest private employers and the largest in Baltimore. The hospital has more than 1,000 beds and more than 1,700 full-time doctors.