The Nurses Organisation says the assault of two Middlemore Hospital nurses could have been avoided, if the district health board had listened to safety fears raised.
The attack happened at 7am today near the entrance of the western campus, leaving one of the nurses with broken bones.
Counties Manukau DHB chief executive Fepulea'i Margie Apa said it's devastating that people who come to work to save lives everyday are vulnerable on their way to and from home.
The New Zealand Nurses Organisation held a rally outside Middlemore Hospital in December to highlight the lack of security at staff carparks which nurses have no option but to use.
One of its delegates, Sela Ikavuka, said staff are angry and scared.
"One of my colleagues told me that in the other carpark ... at 6.45am this morning there were two strangers yelling at staff entering into the hospital, so it could have happened at either carpark."
Ms Ikavuka said the DHB is now organising security staff at the carparks but it should not have taken an attack for this to happen.
Anyone with information about today's assault is being urged to call Middlemore Security or the police.