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Patients were evacuated from the building as staff rushed them to the exits of the hospital which homes a trauma centre with more than 40 beds.

One witness said he “heard them screaming 'code white'" – the call enforced to tell any employees outside of the hospital to stay away due to an emergency.

Another added: "The doctors came in and said that there had been shots fired on the second floor.

"To be in this situation is scary."