The motive for the attack is unclear (Picture: AFP / AP / Reuters)

At least four people were killed last night in a ‘catastrophic’ shooting spree at a hospital in Tulsa, Oklahoma.

Police said the suspected shooter was among the dead, apparently from a self-inflicted gunshot wound.

Officers arrived at the scene at St Francis Hospital in three minutes – which they say ensured the death toll wasn’t higher.

It is unclear what prompted the deadly assault. The unidentified gunman fired both a handgun and a rifle during the attack, according to Tulsa Police Department deputy chief Eric Dalgleish.

‘Officers are currently going through every room in the building checking for additional threats,’ police said in a Facebook post just before 6pm local time.

‘We know there are multiple injuries, and potentially multiple casualties.’

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At least four people were killed (Picture: AFP / AP / Reuters)

Police captain Richard Meulenberg said that by the time police arrived at the medical campus they ‘found a few people have been shot’ and some of them had already died.

It was a ‘catastrophic scene’, he said.

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, which houses an outpatient surgery centre and a breast health centre.

Tulsa resident Nicholas O’Brien, whose mother was in a nearby building when the shooting occurred, told reporters that he rushed to the scene.

‘They were rushing people out. I don’t know if some of them were injured or just have been injured during the shooting, but some of them couldn’t walk very well. But they were just kind of wobbling and stumbling and getting them out of there,’ he said.

Police respond to the scene of a mass shooting at St. Francis Hospital in Tulsa, Oklahoma (Picture: Getty)

‘I was pretty anxious. So once I got here and then I heard that she (his mother) was OK, the shooter had been shot and was down, I felt a lot better. It still is horrible what happened,’ Mr O’Brien said.

US President Joe Biden has been briefed on the Tulsa shooting, White House officials also said in a statement.

The tragedy comes eight days after an 18-year-old gunman armed with an automatic rifle burst into Robb Elementary School in Uvalde, Texas, and killed 19 children and two teachers before being fatally shot himself.

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