Calendar An icon of a desk calendar. Cancel An icon of a circle with a diagonal line across. Caret An icon of a block arrow pointing to the right. Email An icon of a paper envelope. Facebook An icon of the Facebook "f" mark. Google An icon of the Google "G" mark. Linked In An icon of the Linked In "in" mark. Logout An icon representing logout. Profile An icon that resembles human head and shoulders. Telephone An icon of a traditional telephone receiver. Tick An icon of a tick mark. Is Public An icon of a human eye and eyelashes. Is Not Public An icon of a human eye and eyelashes with a diagonal line through it. Pause Icon A two-lined pause icon for stopping interactions. Quote Mark A opening quote mark. Quote Mark A closing quote mark. Arrow An icon of an arrow. Folder An icon of a paper folder. Breaking An icon of an exclamation mark on a circular background. Camera An icon of a digital camera. Caret An icon of a caret arrow. Clock An icon of a clock face. Close An icon of the an X shape. Close Icon An icon used to represent where to interact to collapse or dismiss a component Comment An icon of a speech bubble. Comments An icon of a speech bubble, denoting user comments. Ellipsis An icon of 3 horizontal dots. Envelope An icon of a paper envelope. Facebook An icon of a facebook f logo. Camera An icon of a digital camera. Home An icon of a house. Instagram An icon of the Instagram logo. LinkedIn An icon of the LinkedIn logo. Magnifying Glass An icon of a magnifying glass. Search Icon A magnifying glass icon that is used to represent the function of searching. Menu An icon of 3 horizontal lines. Hamburger Menu Icon An icon used to represent a collapsed menu. Next An icon of an arrow pointing to the right. Notice An explanation mark centred inside a circle. Previous An icon of an arrow pointing to the left. Rating An icon of a star. Tag An icon of a tag. Twitter An icon of the Twitter logo. Video Camera An icon of a video camera shape. Speech Bubble Icon A icon displaying a speech bubble WhatsApp An icon of the WhatsApp logo. Information An icon of an information logo. Plus A mathematical 'plus' symbol. Duration An icon indicating Time. Success Tick An icon of a green tick. Success Tick Timeout An icon of a greyed out success tick. Loading Spinner An icon of a loading spinner.

Four killed in shooting at Oklahoma hospital building

Two people hug outside at Memorial High School where people were evacuated from the scene of a shooting at the Natalie Medical Building (Tulsa World via AP)
Two people hug outside at Memorial High School where people were evacuated from the scene of a shooting at the Natalie Medical Building (Tulsa World via AP)

A gunman carrying a rifle and a handgun has killed four people at a medical building on a hospital campus in Tulsa, Oklahoma.

The incident at the Natalie Medical Building on the St Francis Hospital campus is the latest in a series of deadly mass shootings across America in recent weeks.

Tulsa police department deputy chief Eric Dalgleish confirmed the number of dead and said the shooter is also dead, apparently from a self-inflicted gunshot wound.

The spate of recent gun violence across the US, including the killing of 19 children and two teachers at a Texas elementary school eight days ago by an 18-year-old gunman carrying an AR-style semi-automatic rifle, has led to Democratic leaders amplifying their calls for greater restrictions on guns, while Republicans are emphasising more security at schools.

The divide mirrors a partisan split that has stymied action in US congress and many state capitols over how best to respond to a record-high number of gun-related deaths in the US.

Tulsa Medical Building Shooting
Emergency personnel respond to a shooting at the Natalie Medical Building on the St Francis Hospital campus (Tulsa World via AP)

It was unclear what prompted the deadly assault in Tulsa, Mr Dalgleish said.

“It appears both weapons at one point or another were fired on the scene,” Mr Dalgleish said.

“The officers who arrived were hearing shots in the building, and that’s what led them to the second floor.”

Police responded to the call about three minutes after dispatchers received the report at 4.52pm (10.52pm BST) and made contact with the gunman roughly five minutes later, at 5.01pm (11.01pm BST) Mr Dalgleish said.

Tulsa Medical Building Shooting
Family members hug as they are reunited at Memorial High School after being evacuated from the scene of a shooting at the Natalie Medical Building (Tulsa World via AP)

“I was very happy with what we know so far regarding the response of our officers,” Mr Dalgleish said.

The length of time it took police officers in Uvalde, Texas, to engage the gunman during last week’s deadly shooting at Robb Elementary School has become a key focus of that investigation.

Officers waited over an hour to breach the classroom where the gunman attacked.

Police captain Richard Meulenberg also said multiple people were wounded and that the medical complex was a “catastrophic scene”. The exact number of wounded was not immediately available.

Police and hospital officials said they were not ready to identify the dead.

St Francis Health System locked down its campus on Wednesday afternoon because of the situation at the Natalie Medical Building.

Tulsa Medical Building Shooting
Tulsa Police talk to a young man at Memorial High School as he waits to be reunited with a family member who was evacuated from the scene of the shooting (Tulsa World via AP)

The Natalie building houses an outpatient surgery centre and a breast health centre.

Mr Dalgleish said an orthopaedic clinic is also located on the second floor where officers discovered the shooter and several victims.

“This campus is sacred ground for our community,” said Tulsa mayor GT Bynum.

“For decades, this campus has been a place where heroes come to work every day to save the lives of people in our community.

“Right now, my thoughts are with the victims. If we want to have a policy discussion, that is something to be had in the future, but not tonight.”

Agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives were also at the scene, a spokesperson said.

A reunification centre for families to find their loved ones was set up at a nearby high school.

The shooting Wednesday also comes just more than two weeks after shooting at a Buffalo supermarket by a white man who is accused of killing 10 black people in a racist attack.

America’s recent Memorial Day weekend saw multiple mass shootings nationwide, including at an outdoor festival in Taft, Oklahoma, 45 miles from Tulsa, even as single-death incidents accounted for most gun fatalities.

Since January, there have been 12 shootings across the US where four or more people have been killed, according to The Associated Press/USA TODAY/Northeastern University mass killing database.

Those shootings have left 76 dead, including 31 adults and children in Buffalo and Texas, the database says. The death toll does not include the suspects in the shootings.