Staff at Hawke's Bay Hospital were shocked to find vandals had sprayed graffiti over some of their cars as they worked a late shift on Saturday night.
A staff car was tagged parked on Canning Rd near the hospital and two others in the staff car park at about 9pm.
One of the staff members whose car was targeted did not want to be named but said she was "very frustrated by the senseless vandalism".
"People come to work here to care for people, it doesn't seem right they should finish their work doing just that to find their cars vandalised."
District Health Board Chief executive Kevin Snee called the graffiti "mindless".
"It is unacceptable and security staff will be looking through CCTV footage and working closely with police to try and identify the person or persons responsible" Dr Snee said.
Intel collector Susan Guy, of the Hastings Police, said they had a pretty good idea of who the offenders were.
"They were caught on CCTV. We know they are part of a youth tagging crew and that they are aged between 13 to 15 and normally travel in groups of four to seven."
She said the letters tagged were WDS and that the police believed that stood for "Dog Soldiers". Youth gangs were competing in the region. .
"Whoever can tag the biggest or highest tags gets the most cred. Mitre 10 and Pak'nSave have been tagged, too," Ms Guy said. She appealed to the community to put pressure on the young people involved to hand themselves in.